Fix nullability errors.

Fix #2425

.github/ISSUE_TEMPLATE/bug_report.md

@@ -11,10 +11,10 @@ assignees: ''
 
 IMPORTANT: Read this first!!!
 
-1. If you own a Radzen Professional or Еnterprise subscription you can report your issue or ask us a question via email at info@radzen.com. Radzen staff will reply within 24 hours (Professional) or 16 hours (Enterprise)
+1. If you own a Radzen Blazor Pro or Team subscription you can also report your issue or ask us a question via email at info@radzen.com. Radzen staff will reply within 24 hours (Pro) or 16 hours (Team)
 2. The Radzen staff guarantees a response to issues in this repo only to paid subscribers. 
 3. If you have a HOW TO question start a new forum thread in the Radzen Community forum: https://forum.radzen.com. Radzen staff will close issues that are HOWTO questions.
-4. Please adhere to the issue template. Specify all the steps required to reproduce the issue or link a project which reproduces it easily (without requiring extra steps such as restoring a database).
+4. Please adhere to the issue template. Specify all the steps required to reproduce the issue.
 -->
 
 **Describe the bug**
@@ -27,7 +27,12 @@ Steps to reproduce the behavior:
 3. Scroll down to '....'
 4. See error
 
-Alternatively link your repo with a sample project that can be run.
+Alternatively make a new [playground](https://blazor.radzen.com/playground) snippet and paste its URL.
+1. Go to any live demo at https://blazor.radzen.com
+2. Click the **Edit Source** tab.
+3. Then click **Open in Playground**.
+4. Reproduce the problem and save the snippet.
+5. Copy the snippet URL and provide it in the issue description.
 
 **Expected behavior**
 A clear and concise description of what you expected to happen.

.github/ISSUE_TEMPLATE/config.yml

@@ -5,4 +5,4 @@ contact_links:
     about: Please ask and answer questions here.
   - name: Radzen Commercial Support 
     url: info@radzen.com
-    about: Radzen Professional or Enterprise subscribers can get dedicated support over email.
+    about: Radzen Blazor subscribers can get dedicated support over email.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -11,7 +11,7 @@ assignees: ''
 
 IMPORTANT: Read this first!!!
 
-1. If you own a Radzen Professional or Еnterprise subscription you can request your feature via email at info@radzen.com. Radzen staff will reply within 24 hours (Professional) or 16 hours (Enterprise)
+1. If you own a Radzen Blazor subscription you can request your feature via email at info@radzen.com. Radzen staff will reply within 24 hours (Pro) or 16 hours (Team)
 2. The Radzen staff guarantees a response to issues in this repo only to paid subscribers. 
 3. If you have a HOW TO question start a new forum thread in the Radzen Community forum: https://forum.radzen.com. Radzen staff will close issues that are HOWTO questions.
 4. Please adhere to the issue template. 

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 9.0.x
+        dotnet-version: 10.0.x
     
     - name: Build
       run: dotnet build Radzen.Blazor/Radzen.Blazor.csproj

.github/workflows/deploy.yml

@@ -0,0 +1,66 @@
+name: Deploy to blazor.radzen.com
+
+on:
+  workflow_dispatch:
+
+concurrency:
+  group: blazor-radzen-prod
+  cancel-in-progress: true
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    env:
+      REGISTRY: ghcr.io
+      IMAGE_NAME: ${{ github.repository }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Compute image tag (timestamp)
+        id: meta
+        run: |
+          TAG=$(date -u +"%Y%m%d%H%M%S")
+          IMAGE="${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${TAG}"
+          echo "image=$IMAGE" >> "$GITHUB_OUTPUT"
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.image }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Push to dokku
+        uses: dokku/github-action@master
+        with:
+          git_remote_url: ${{ secrets.DOKKU_REPO }}
+          ssh_private_key: ${{ secrets.DOKKU_SSH_PRIVATE_KEY }}
+          deploy_docker_image: ${{ steps.meta.outputs.image }}
+
+      - name: Prune GHCR versions (keep 1)
+        uses: actions/delete-package-versions@v5
+        with:
+          package-name: radzen-blazor
+          package-type: container
+          min-versions-to-keep: 1
+          delete-only-pre-release-versions: false

.gitignore

@@ -341,3 +341,10 @@ Radzen.DocFX/_exported_templates
 Radzen.DocFX/api/*.yml
 !Radzen.DocFX/api/index.md
 Radzen.DocFX/api/.manifest
+Radzen.Blazor.min.js
+/.claude
+/SANKEY_PATTERN_COMPARISON.md
+*.md
+/.gitignore
+/.gitignore
+RadzenBlazorDemos/wwwroot/demos

CONTRIBUTING.md

@@ -19,7 +19,7 @@ You can ask your question here. Please use the [Radzen.Blazor Components](https:
 
 ### Dedicated technical support
 
-Radzen staff provides technical support with guaranteed response time to Radzen Professional and Enterprise subscribers. The pricing options are available [here](https://www.radzen.com/blazor-studio/pricing/).
+Radzen staff provides technical support with guaranteed response time to Radzen Professional and Enterprise subscribers. The pricing options are available [here](https://www.radzen.com/pricing).
 
 ## How Can I Contribute?
 

Directory.Build.props

@@ -0,0 +1,85 @@
+<Project>
+  <!-- 
+    Common build properties for all projects in the Radzen.Blazor solution.
+    
+    To use this file:
+    1. Rename to Directory.Build.props (remove .sample extension)
+    2. Adjust settings based on your needs
+    3. Review the analyzer settings in .editorconfig
+    
+    This file will be automatically imported by all projects in subdirectories.
+  -->
+
+  <PropertyGroup Label="Language Configuration">
+    <!-- Use latest C# language features -->
+    <LangVersion>latest</LangVersion>
+    
+    <!-- Do NOT enable implicit usings - explicit imports preferred for library code -->
+    <ImplicitUsings>disable</ImplicitUsings>
+    
+    <Nullable>enable</Nullable>
+    <NoWarn>CA2007</NoWarn>
+  </PropertyGroup>
+
+  <PropertyGroup Label="Code Analysis Configuration">
+    <!-- Enable .NET code analyzers -->
+    <AnalysisLevel>latest</AnalysisLevel>
+    <EnableNETAnalyzers>true</EnableNETAnalyzers>
+    
+    <!-- Run analyzers during build and in IDE -->
+    <RunAnalyzersDuringBuild>true</RunAnalyzersDuringBuild>
+    <RunAnalyzersDuringLiveAnalysis>true</RunAnalyzersDuringLiveAnalysis>
+    
+    <!-- Don't enforce code style in build (yet) - just show warnings -->
+    <EnforceCodeStyleInBuild>false</EnforceCodeStyleInBuild>
+    
+    <!-- Don't treat warnings as errors (yet) - too many to fix immediately -->
+    <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    
+    <!-- Report all analyzer diagnostics -->
+    <AnalysisMode>All</AnalysisMode>
+  </PropertyGroup>
+
+  <PropertyGroup Label="Build Quality">
+    <!-- Enable deterministic builds for reproducibility -->
+    <Deterministic>true</Deterministic>
+    
+    <!-- Enable deterministic builds in CI/CD -->
+    <ContinuousIntegrationBuild Condition="'$(CI)' == 'true'">true</ContinuousIntegrationBuild>
+    
+    <!-- Embed source files for better debugging -->
+    <EmbedAllSources>true</EmbedAllSources>
+    <!--
+      IMPORTANT:
+      - NuGet symbol packages (.snupkg) require portable PDB files.
+      - If DebugType=embedded, there are no standalone PDBs, so the .snupkg ends up effectively empty.
+      Use portable PDBs when symbols are enabled; otherwise use embedded for local debugging convenience.
+    -->
+    <!--
+      NOTE: Directory.Build.props is imported before project files, so properties like IncludeSymbols
+      set in a .csproj may not be available yet for Conditions here.
+      IsPacking *is* set by `dotnet pack`, so use that to switch DebugType for symbol packages.
+    -->
+    <DebugType Condition="'$(IsPacking)' == 'true'">portable</DebugType>
+    <DebugType Condition="'$(IsPacking)' != 'true'">embedded</DebugType>
+  </PropertyGroup>
+
+  <PropertyGroup Label="Demos and Tests Project Configuration" Condition="$(MSBuildProjectName.Contains('Demos')) OR $(MSBuildProjectName.Contains('Tests'))">
+    <!-- Demo projects and Tests should not be packable -->
+    <IsPackable>false</IsPackable>
+    
+    <!-- DISABLE ALL ANALYZERS FOR DEMO PROJECTS AND TESTS -->
+    <EnableNETAnalyzers>false</EnableNETAnalyzers>
+    <RunAnalyzersDuringBuild>false</RunAnalyzersDuringBuild>
+    <RunAnalyzersDuringLiveAnalysis>false</RunAnalyzersDuringLiveAnalysis>
+    <EnforceCodeStyleInBuild>false</EnforceCodeStyleInBuild>
+  </PropertyGroup>
+
+  <PropertyGroup Label="Performance">
+    <!-- Optimize startup time -->
+    <TieredCompilation>true</TieredCompilation>
+    <TieredCompilationQuickJit>true</TieredCompilationQuickJit>
+  </PropertyGroup>
+
+</Project>
+

Dockerfile

@@ -1,31 +1,48 @@
-# syntax=docker/dockerfile:1
-FROM mono:latest
+# =============================
+# BUILD STAGE
+# =============================
+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+WORKDIR /src
 
-ENV DOCFX_VER 2.58.4
+# Copy project files first for better caching
+COPY Radzen.Blazor/*.csproj Radzen.Blazor/
+COPY RadzenBlazorDemos/*.csproj RadzenBlazorDemos/
+COPY RadzenBlazorDemos.Host/*.csproj RadzenBlazorDemos.Host/
 
-RUN apt-get update && apt-get install unzip wget git -y && wget -q -P /tmp https://github.com/dotnet/docfx/releases/download/v${DOCFX_VER}/docfx.zip && \
-    mkdir -p /opt/docfx && \
-    unzip /tmp/docfx.zip -d /opt/docfx && \
-    echo '#!/bin/bash\nmono /opt/docfx/docfx.exe $@' > /usr/bin/docfx && \
-    chmod +x /usr/bin/docfx && \
-    rm -rf /tmp/*
+# Radzen.DocFX usually has no csproj → copy full folder
+COPY Radzen.DocFX/ Radzen.DocFX/
 
-COPY Radzen.Blazor /app/Radzen.Blazor
-COPY Radzen.DocFX /app/DocFX
-COPY RadzenBlazorDemos /app/RadzenBlazorDemos
-COPY RadzenBlazorDemos.Host /app/RadzenBlazorDemos.Host
+# Restore dependencies
+RUN dotnet restore RadzenBlazorDemos.Host/RadzenBlazorDemos.Host.csproj
+
+# Copy full source after restore layer
+COPY . .
+
+# Install docfx (build stage only)
+RUN dotnet tool install -g docfx
+ENV PATH="$PATH:/root/.dotnet/tools"
+
+# Build shared project (keep net8.0 if required)
+RUN dotnet build -c Release Radzen.Blazor/Radzen.Blazor.csproj -f net8.0
+
+# Generate documentation
+RUN docfx Radzen.DocFX/docfx.json
+
+# Publish the Blazor host app
+WORKDIR /src/RadzenBlazorDemos.Host
+RUN dotnet publish -c Release -o /app/out
+
+
+# =============================
+# RUNTIME STAGE
+# =============================
+FROM mcr.microsoft.com/dotnet/aspnet:10.0 AS runtime
 WORKDIR /app
-RUN docfx DocFX/docfx.json
 
-FROM mcr.microsoft.com/dotnet/sdk:9.0
+# Copy only published output
+COPY --from=build /app/out ./
 
-COPY --from=0 /app/RadzenBlazorDemos.Host /app/RadzenBlazorDemos.Host
-COPY --from=0 /app/RadzenBlazorDemos /app/RadzenBlazorDemos
-
-WORKDIR /app/RadzenBlazorDemos.Host
-RUN dotnet publish -c Release -o out
-
-ENV ASPNETCORE_URLS http://*:5000
-WORKDIR /app/RadzenBlazorDemos.Host/out
+# Set runtime URL
+ENV ASPNETCORE_URLS=http://+:5000
 
 ENTRYPOINT ["dotnet", "RadzenBlazorDemos.Host.dll"]

LICENSE

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2018-2025 Radzen Ltd
+Copyright (c) 2018-2026 Radzen Ltd
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -3,7 +3,7 @@
 Radzen Blazor Components
 ========================
 
-A set of **90+ free and open source** native Blazor UI controls.
+The most sophisticated free UI component library for Blazor, featuring **100+ native components**.
 
 See Online Demos or Read the Docs
 
@@ -15,7 +15,7 @@ See Online Demos or Read the Docs
 
 Radzen Blazor Components are open source and free for commercial use. You can install them from [NuGet](https://www.nuget.org/packages/Radzen.Blazor) or build your own copy from source.
 
-Paid support is available as part of the [Radzen Professional subscription](https://www.radzen.com/blazor-studio/pricing/).
+Paid support is available as part of the [Radzen Blazor subscription](https://www.radzen.com/pricing).
 
 ### :computer: Native
 
@@ -38,9 +38,9 @@ Everybody is welcome to visit the [Radzen Community forum](https://forum.radzen.
 
 The Radzen team monitors the forum threads, but does not guarantee a response to every question. For guaranteed responses you may consider the dedicated support option.
 
-Dedicated support for the Radzen Blazor Components is available as part of the [Radzen Professional subscription](https://www.radzen.com/blazor-studio/pricing/).
+Dedicated support for the Radzen Blazor Components is available as part of the [Radzen Blazor subscription](https://www.radzen.com/pricing).
 
-Our flagship product [Radzen Blazor Studio](https://www.radzen.com/blazor-studio/) provides tons of productivity features for Blazor developers:
+Our flagship product [Radzen Blazor Studio](https://www.radzen.com/blazor-studio) provides tons of productivity features for Blazor developers:
 - An industry-leading WYSIWYG Blazor design time canvas
 - Scaffolding a complete CRUD applications from a database
 - Built-in security - authentication and authorization
@@ -50,8 +50,8 @@ Our flagship product [Radzen Blazor Studio](https://www.radzen.com/blazor-studio
 
 ## Get started with Radzen Blazor Components
 
-Check the [getting started](https://blazor.radzen.com/getting-started) instructions to start making awesome Blazor applications.
+Check the [getting started](https://blazor.radzen.com/get-started) instructions to start making awesome Blazor applications.
 
 ## Run demos locally
 
-Use Radzen.Server.sln to open and run demos as Blazor server application or Radzen.WebAssembly.sln to open and run demos as Blazor WebAssembly application. Radzen.sln has reference to all projects including tests.
+Use **Radzen.Server.sln** to open and run demos as Blazor server application or **Radzen.WebAssembly.sln** to open and run demos as Blazor WebAssembly application. The demos require the .NET 10 SDK and should preferably be opened in VS2026.

Radzen.Blazor.Tests/AIChatTests.cs

@@ -0,0 +1,171 @@
+using Bunit;
+using Microsoft.Extensions.DependencyInjection;
+using Radzen;
+using System;
+using System.Net.Http;
+using Microsoft.Extensions.Options;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class AIChatTests
+    {
+        private void RegisterChatService(TestContext ctx)
+        {
+            // Register a dummy HttpClient and default options for AIChatService
+            ctx.Services.AddSingleton(new HttpClient());
+            ctx.Services.AddScoped<IAIChatService, AIChatService>();
+        }
+
+        [Fact]
+        public void RadzenAIChat_ShouldRenderWithDefaultProperties()
+        {
+            using var ctx = new TestContext();
+            RegisterChatService(ctx);
+            var component = ctx.RenderComponent<RadzenAIChat>();
+            Assert.Contains("Type your message...", component.Markup);
+        }
+
+        [Fact]
+        public void RadzenAIChat_ShouldRenderWithCustomTitle()
+        {
+            using var ctx = new TestContext();
+            RegisterChatService(ctx);
+            var component = ctx.RenderComponent<RadzenAIChat>(parameters => parameters
+                .Add(p => p.Title, "Custom Chat"));
+            Assert.Contains("Custom Chat", component.Markup);
+        }
+
+        [Fact]
+        public void RadzenAIChat_ShouldRenderWithCustomPlaceholder()
+        {
+            using var ctx = new TestContext();
+            RegisterChatService(ctx);
+            var component = ctx.RenderComponent<RadzenAIChat>(parameters => parameters
+                .Add(p => p.Placeholder, "Enter your message here..."));
+            Assert.Contains("Enter your message here...", component.Markup);
+        }
+
+        [Fact]
+        public void RadzenAIChat_ShouldRenderWithCustomEmptyMessage()
+        {
+            using var ctx = new TestContext();
+            RegisterChatService(ctx);
+            var component = ctx.RenderComponent<RadzenAIChat>(parameters => parameters
+                .Add(p => p.EmptyMessage, "No messages yet"));
+            Assert.Contains("No messages yet", component.Markup);
+        }
+
+        [Fact]
+        public void RadzenAIChat_ShouldShowClearButtonByDefault()
+        {
+            using var ctx = new TestContext();
+            RegisterChatService(ctx);
+            var component = ctx.RenderComponent<RadzenAIChat>();
+            Assert.Contains("rz-chat-header-clear", component.Markup);
+        }
+
+        [Fact]
+        public void RadzenAIChat_ShouldHideClearButtonWhenShowClearButtonIsFalse()
+        {
+            using var ctx = new TestContext();
+            RegisterChatService(ctx);
+            var component = ctx.RenderComponent<RadzenAIChat>(parameters => parameters
+                .Add(p => p.ShowClearButton, false));
+            Assert.DoesNotContain("clear_all", component.Markup);
+        }
+
+        [Fact]
+        public void RadzenAIChat_ShouldBeDisabledWhenDisabledIsTrue()
+        {
+            using var ctx = new TestContext();
+            RegisterChatService(ctx);
+            var component = ctx.RenderComponent<RadzenAIChat>(parameters => parameters
+                .Add(p => p.Disabled, true));
+            Assert.Contains("disabled", component.Markup);
+        }
+
+        [Fact]
+        public void RadzenAIChat_ShouldBeReadOnlyWhenReadOnlyIsTrue()
+        {
+            using var ctx = new TestContext();
+            RegisterChatService(ctx);
+            var component = ctx.RenderComponent<RadzenAIChat>(parameters => parameters
+                .Add(p => p.ReadOnly, true));
+            Assert.Contains("readonly", component.Markup);
+        }
+
+        [Fact]
+        public void RadzenAIChat_ShouldHaveCorrectCssClass()
+        {
+            using var ctx = new TestContext();
+            RegisterChatService(ctx);
+            var component = ctx.RenderComponent<RadzenAIChat>();
+            Assert.Contains("rz-chat", component.Markup);
+        }
+
+        [Fact]
+        public void ChatMessage_ShouldHaveCorrectProperties()
+        {
+            // Arrange
+            var message = new ChatMessage
+            {
+                Content = "Test message",
+                IsUser = true,
+                Timestamp = DateTime.Now
+            };
+            // Assert
+            Assert.NotEmpty(message.Id);
+            Assert.Equal("Test message", message.Content);
+            Assert.True(message.IsUser);
+            Assert.False(message.IsStreaming);
+        }
+
+        [Fact]
+        public void RadzenAIChat_AddMessage_ShouldAddMessageToList()
+        {
+            using var ctx = new TestContext();
+            RegisterChatService(ctx);
+            var component = ctx.RenderComponent<RadzenAIChat>();
+            // Act
+            component.Instance.AddMessage("Test message", true);
+            // Assert
+            var messages = component.Instance.GetMessages();
+            Assert.Single(messages);
+            Assert.Equal("Test message", messages[0].Content);
+            Assert.True(messages[0].IsUser);
+        }
+
+        [Fact]
+        public void RadzenAIChat_ClearChat_ShouldRemoveAllMessages()
+        {
+            using var ctx = new TestContext();
+            RegisterChatService(ctx);
+            var component = ctx.RenderComponent<RadzenAIChat>();
+            component.Instance.AddMessage("Test message 1", true);
+            component.Instance.AddMessage("Test message 2", false);
+            // Act
+            component.InvokeAsync(async () => await component.Instance.ClearChat()).Wait();
+            // Assert
+            Assert.Empty(component.Instance.GetMessages());
+        }
+
+        [Fact]
+        public void RadzenAIChat_ShouldLimitMessagesToMaxMessages()
+        {
+            using var ctx = new TestContext();
+            RegisterChatService(ctx);
+            var component = ctx.RenderComponent<RadzenAIChat>(parameters => parameters.Add(p => p.MaxMessages, 3));
+            component.Instance.AddMessage("Message 1", true);
+            component.Instance.AddMessage("Message 2", false);
+            component.Instance.AddMessage("Message 3", true);
+            component.Instance.AddMessage("Message 4", false);
+            // Assert
+            var messages = component.Instance.GetMessages();
+            Assert.Equal(3, messages.Count);
+            Assert.Equal("Message 2", messages[0].Content);
+            Assert.Equal("Message 3", messages[1].Content);
+            Assert.Equal("Message 4", messages[2].Content);
+        }
+    }
+} 

Radzen.Blazor.Tests/AccordionTests.cs

@@ -0,0 +1,195 @@
+using Bunit;
+using Microsoft.AspNetCore.Components;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class AccordionTests
+    {
+        [Fact]
+        public void Accordion_Renders_CssClasses()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenAccordion>();
+
+            Assert.Contains(@"rz-accordion", component.Markup);
+        }
+
+        [Fact]
+        public void Accordion_Renders_AccordionItems()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenAccordion>(parameters =>
+            {
+                parameters.Add(p => p.Items, builder =>
+                {
+                    builder.OpenComponent<RadzenAccordionItem>(0);
+                    builder.AddAttribute(1, "Text", "Test Item");
+                    builder.AddAttribute(2, "ChildContent", (RenderFragment)(contentBuilder =>
+                    {
+                        contentBuilder.AddContent(0, "Item Content");
+                    }));
+                    builder.CloseComponent();
+                });
+            });
+
+            Assert.Contains("Test Item", component.Markup);
+            Assert.Contains("Item Content", component.Markup);
+        }
+
+        [Fact]
+        public void Accordion_Renders_ItemWithIcon()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenAccordion>(parameters =>
+            {
+                parameters.Add(p => p.Items, builder =>
+                {
+                    builder.OpenComponent<RadzenAccordionItem>(0);
+                    builder.AddAttribute(1, "Text", "Orders");
+                    builder.AddAttribute(2, "Icon", "account_balance_wallet");
+                    builder.AddAttribute(3, "ChildContent", (RenderFragment)(contentBuilder =>
+                    {
+                        contentBuilder.AddContent(0, "Order Details");
+                    }));
+                    builder.CloseComponent();
+                });
+            });
+
+            Assert.Contains("account_balance_wallet", component.Markup);
+            Assert.Contains("Orders", component.Markup);
+        }
+
+        [Fact]
+        public void Accordion_SingleExpand_OnlyOneItemExpanded()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenAccordion>(parameters =>
+            {
+                parameters.Add(p => p.Multiple, false); // Single expand mode
+                parameters.Add(p => p.Items, builder =>
+                {
+                    // Add first item
+                    builder.OpenComponent<RadzenAccordionItem>(0);
+                    builder.AddAttribute(1, "Text", "Item 1");
+                    builder.AddAttribute(2, "ChildContent", (RenderFragment)(b => b.AddContent(0, "Content 1")));
+                    builder.CloseComponent();
+
+                    // Add second item
+                    builder.OpenComponent<RadzenAccordionItem>(1);
+                    builder.AddAttribute(1, "Text", "Item 2");
+                    builder.AddAttribute(2, "ChildContent", (RenderFragment)(b => b.AddContent(0, "Content 2")));
+                    builder.CloseComponent();
+                });
+            });
+
+            Assert.False(component.Instance.Multiple);
+        }
+
+        [Fact]
+        public void Accordion_MultipleExpand_AllowsMultipleItemsExpanded()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenAccordion>(parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+            });
+
+            Assert.True(component.Instance.Multiple);
+        }
+
+        [Fact]
+        public void Accordion_Raises_ExpandEvent()
+        {
+            using var ctx = new TestContext();
+            
+            var expandRaised = false;
+            int expandedIndex = -1;
+
+            var component = ctx.RenderComponent<RadzenAccordion>(parameters =>
+            {
+                parameters.Add(p => p.Expand, EventCallback.Factory.Create<int>(this, (index) =>
+                {
+                    expandRaised = true;
+                    expandedIndex = index;
+                }));
+                parameters.Add(p => p.Items, builder =>
+                {
+                    builder.OpenComponent<RadzenAccordionItem>(0);
+                    builder.AddAttribute(1, "Text", "Test Item");
+                    builder.AddAttribute(2, "ChildContent", (RenderFragment)(b => b.AddContent(0, "Content")));
+                    builder.CloseComponent();
+                });
+            });
+
+            // Find and click the accordion header link to expand
+            var header = component.Find(".rz-accordion-header a");
+            header.Click();
+
+            Assert.True(expandRaised);
+            Assert.Equal(0, expandedIndex);
+        }
+
+        [Fact]
+        public void Accordion_Raises_CollapseEvent()
+        {
+            using var ctx = new TestContext();
+            
+            var collapseRaised = false;
+            int collapsedIndex = -1;
+
+            var component = ctx.RenderComponent<RadzenAccordion>(parameters =>
+            {
+                parameters.Add(p => p.Collapse, EventCallback.Factory.Create<int>(this, (index) =>
+                {
+                    collapseRaised = true;
+                    collapsedIndex = index;
+                }));
+                parameters.Add(p => p.Items, builder =>
+                {
+                    builder.OpenComponent<RadzenAccordionItem>(0);
+                    builder.AddAttribute(1, "Text", "Test Item");
+                    builder.AddAttribute(2, "Selected", true); // Start expanded
+                    builder.AddAttribute(3, "ChildContent", (RenderFragment)(b => b.AddContent(0, "Content")));
+                    builder.CloseComponent();
+                });
+            });
+
+            // Find and click the accordion header link to collapse
+            var header = component.Find(".rz-accordion-header a");
+            header.Click();
+
+            Assert.True(collapseRaised);
+            Assert.Equal(0, collapsedIndex);
+        }
+
+        [Fact]
+        public void Accordion_DisabledItem_CannotExpand()
+        {
+            using var ctx = new TestContext();
+            
+            var expandRaised = false;
+
+            var component = ctx.RenderComponent<RadzenAccordion>(parameters =>
+            {
+                parameters.Add(p => p.Expand, EventCallback.Factory.Create<int>(this, (_) => expandRaised = true));
+                parameters.Add(p => p.Items, builder =>
+                {
+                    builder.OpenComponent<RadzenAccordionItem>(0);
+                    builder.AddAttribute(1, "Text", "Disabled Item");
+                    builder.AddAttribute(2, "Disabled", true);
+                    builder.AddAttribute(3, "ChildContent", (RenderFragment)(b => b.AddContent(0, "Content")));
+                    builder.CloseComponent();
+                });
+            });
+
+            // Try to click the disabled item
+            var header = component.Find(".rz-accordion-header a");
+            header.Click();
+
+            // Event should not be raised for disabled item
+            Assert.False(expandRaised);
+        }
+    }
+}
+

Radzen.Blazor.Tests/AlertTests.cs

@@ -0,0 +1,195 @@
+using Bunit;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class AlertTests
+    {
+        [Fact]
+        public void Alert_Renders_CssClasses()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenAlert>();
+
+            Assert.Contains(@"rz-alert", component.Markup);
+        }
+
+        [Fact]
+        public void Alert_Renders_AlertStyle()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenAlert>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.AlertStyle, AlertStyle.Danger));
+            Assert.Contains("rz-danger", component.Markup);
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.AlertStyle, AlertStyle.Success));
+            Assert.Contains("rz-success", component.Markup);
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.AlertStyle, AlertStyle.Warning));
+            Assert.Contains("rz-warning", component.Markup);
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.AlertStyle, AlertStyle.Info));
+            Assert.Contains("rz-info", component.Markup);
+        }
+
+        [Fact]
+        public void Alert_Renders_Shade()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenAlert>();
+
+            component.SetParametersAndRender(parameters => parameters
+                .Add(p => p.AlertStyle, AlertStyle.Primary)
+                .Add(p => p.Shade, Shade.Lighter));
+
+            Assert.Contains("rz-shade-lighter", component.Markup);
+
+            component.SetParametersAndRender(parameters => parameters
+                .Add(p => p.AlertStyle, AlertStyle.Primary)
+                .Add(p => p.Shade, Shade.Darker));
+
+            Assert.Contains("rz-shade-darker", component.Markup);
+        }
+
+        [Fact]
+        public void Alert_Renders_Variant()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenAlert>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Variant, Variant.Outlined));
+            Assert.Contains("rz-variant-outlined", component.Markup);
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Variant, Variant.Flat));
+            Assert.Contains("rz-variant-flat", component.Markup);
+        }
+
+        [Fact]
+        public void Alert_Renders_Title()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenAlert>();
+
+            var title = "Alert Title";
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Title, title));
+
+            Assert.Contains(title, component.Markup);
+            Assert.Contains("rz-alert-title", component.Markup);
+        }
+
+        [Fact]
+        public void Alert_Renders_Text()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenAlert>();
+
+            var text = "This is an alert message";
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Text, text));
+
+            Assert.Contains(text, component.Markup);
+        }
+
+        [Fact]
+        public void Alert_Renders_ChildContent()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenAlert>(parameters =>
+            {
+                parameters.AddChildContent("Custom alert content");
+            });
+
+            Assert.Contains("Custom alert content", component.Markup);
+        }
+
+        [Fact]
+        public void Alert_ShowIcon_DisplaysIcon()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenAlert>();
+
+            // Default should show icon
+            Assert.Contains("rz-alert-icon", component.Markup);
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.ShowIcon, false));
+            Assert.DoesNotContain("rz-alert-icon", component.Markup);
+        }
+
+        [Fact]
+        public void Alert_AllowClose_DisplaysCloseButton()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenAlert>();
+
+            // Default AllowClose is true - should contain a button with close icon
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.AllowClose, true));
+            Assert.Contains("close", component.Markup);
+            Assert.Contains("rz-button", component.Markup);
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.AllowClose, false));
+            // When AllowClose is false, should not have close button
+            var buttonCount = System.Text.RegularExpressions.Regex.Matches(component.Markup, "rz-button").Count;
+            Assert.Equal(0, buttonCount);
+        }
+
+        [Fact]
+        public void Alert_CloseButton_RaisesCloseEvent()
+        {
+            using var ctx = new TestContext();
+            
+            var closeRaised = false;
+
+            var component = ctx.RenderComponent<RadzenAlert>(parameters =>
+            {
+                parameters.Add(p => p.AllowClose, true);
+                parameters.Add(p => p.Close, () => closeRaised = true);
+            });
+
+            var closeButton = component.Find("button.rz-button");
+            closeButton.Click();
+
+            Assert.True(closeRaised);
+        }
+
+        [Fact]
+        public void Alert_Visible_ControlsDisplay()
+        {
+            using var ctx = new TestContext();
+            
+            var component = ctx.RenderComponent<RadzenAlert>(parameters =>
+            {
+                parameters.Add(p => p.Visible, true);
+                parameters.Add(p => p.Text, "Visible Alert");
+            });
+
+            Assert.Contains("Visible Alert", component.Markup);
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Visible, false));
+
+            // When not visible, component should not render
+            Assert.DoesNotContain("Visible Alert", component.Markup);
+        }
+
+        [Fact]
+        public void Alert_CloseButton_SetsVisibleToFalse()
+        {
+            using var ctx = new TestContext();
+            
+            var visibleValue = true;
+
+            var component = ctx.RenderComponent<RadzenAlert>(parameters =>
+            {
+                parameters.Add(p => p.Visible, visibleValue);
+                parameters.Add(p => p.AllowClose, true);
+                parameters.Add(p => p.VisibleChanged, (bool value) => visibleValue = value);
+            });
+
+            var closeButton = component.Find("button.rz-button");
+            closeButton.Click();
+
+            Assert.False(visibleValue);
+        }
+    }
+}
+
+

Radzen.Blazor.Tests/AutoCompleteTests.cs

@@ -1,9 +1,77 @@
-using Xunit;
+using System.Collections;
+using Bunit;
+using Xunit;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
 
 namespace Radzen.Blazor.Tests
 {
 	public class AutoCompleteTests
 	{
+        [Fact]
+        public void AutoComplete_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenAutoComplete>();
+
+            Assert.Contains(@"rz-autocomplete", component.Markup);
+        }
+
+        [Fact]
+        public void AutoComplete_Renders_InputElement()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenAutoComplete>();
+
+            Assert.Contains("type=\"text\"", component.Markup);
+            Assert.Contains("rz-inputtext", component.Markup);
+        }
+
+        [Fact]
+        public void AutoComplete_Renders_Disabled()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenAutoComplete>(parameters =>
+            {
+                parameters.Add(p => p.Disabled, true);
+            });
+
+            Assert.Contains("disabled", component.Markup);
+            Assert.Contains("rz-state-disabled", component.Markup);
+        }
+
+        [Fact]
+        public void AutoComplete_Renders_Placeholder()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenAutoComplete>(parameters =>
+            {
+                parameters.Add(p => p.Placeholder, "Type to search...");
+            });
+
+            Assert.Contains("placeholder=\"Type to search...\"", component.Markup);
+        }
+
+        [Fact]
+        public void AutoComplete_Renders_WithData()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<string> { "Apple", "Banana", "Cherry" };
+
+            var component = ctx.RenderComponent<RadzenAutoComplete>(parameters =>
+            {
+                parameters.Add(p => p.Data, data);
+            });
+
+            Assert.Contains("rz-autocomplete-panel", component.Markup);
+        }
+
         [Fact]
         public void AutoComplete_Enum_Converts_To_Attr_Value()
         {
@@ -70,5 +138,30 @@ namespace Radzen.Blazor.Tests
             Assert.Equal("additional-name", AutoCompleteType.MiddleName.GetAutoCompleteValue());
             Assert.Equal("family-name", AutoCompleteType.LastName.GetAutoCompleteValue());
         }
+
+        [Fact]
+        public void AutoComplete_Filters_StringList()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<string> { "Apple", "Banana", "Cherry" };
+
+            var component = ctx.RenderComponent<AutoCompleteWithAccessibleView>(parameters =>
+            {
+                parameters
+                    .Add(p => p.Data, data)
+                    .Add(p => p.SearchText, "Ban")
+                    .Add(p => p.OpenOnFocus, true);
+            });
+            
+            Assert.Contains("Banana", component.Instance.CurrentView.OfType<string>());
+            Assert.DoesNotContain("Apple", component.Instance.CurrentView.OfType<string>());
+            Assert.DoesNotContain("Cherry", component.Instance.CurrentView.OfType<string>());
+        }
+        
+        private sealed class AutoCompleteWithAccessibleView : RadzenAutoComplete
+        {
+            public IEnumerable CurrentView => View;
+        }
     }
 }

Radzen.Blazor.Tests/CardTests.cs

@@ -0,0 +1,46 @@
+using Bunit;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class CardTests
+    {
+        [Fact]
+        public void Card_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenCard>();
+
+            Assert.Contains(@"rz-card", component.Markup);
+        }
+
+        [Fact]
+        public void Card_Renders_ChildContent()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenCard>(parameters =>
+            {
+                parameters.AddChildContent("<div>Card Content</div>");
+            });
+
+            Assert.Contains("Card Content", component.Markup);
+        }
+
+        [Fact]
+        public void Card_Renders_Variant()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenCard>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Variant, Variant.Outlined));
+            Assert.Contains("rz-variant-outlined", component.Markup);
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Variant, Variant.Filled));
+            Assert.Contains("rz-variant-filled", component.Markup);
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Variant, Variant.Flat));
+            Assert.Contains("rz-variant-flat", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/CarouselTests.cs

@@ -0,0 +1,173 @@
+using Bunit;
+using Microsoft.AspNetCore.Components;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class CarouselTests
+    {
+        [Fact]
+        public void Carousel_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenCarousel>();
+
+            Assert.Contains(@"rz-carousel", component.Markup);
+        }
+
+        [Fact]
+        public void Carousel_Renders_AllowPaging_True()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenCarousel>(parameters =>
+            {
+                parameters.Add(p => p.AllowPaging, true);
+                parameters.Add(p => p.Items, builder =>
+                {
+                    builder.OpenComponent<RadzenCarouselItem>(0);
+                    builder.AddAttribute(1, "ChildContent", (RenderFragment)(b => b.AddContent(0, "Slide 1")));
+                    builder.CloseComponent();
+                    
+                    builder.OpenComponent<RadzenCarouselItem>(2);
+                    builder.AddAttribute(3, "ChildContent", (RenderFragment)(b => b.AddContent(0, "Slide 2")));
+                    builder.CloseComponent();
+                });
+            });
+
+            Assert.Contains("rz-carousel-pager-button", component.Markup);
+        }
+
+        [Fact]
+        public void Carousel_Renders_AllowPaging_False()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenCarousel>(parameters =>
+            {
+                parameters.Add(p => p.AllowPaging, false);
+                parameters.Add(p => p.Items, builder =>
+                {
+                    builder.OpenComponent<RadzenCarouselItem>(0);
+                    builder.AddAttribute(1, "ChildContent", (RenderFragment)(b => b.AddContent(0, "Slide 1")));
+                    builder.CloseComponent();
+                });
+            });
+
+            Assert.DoesNotContain("rz-carousel-pager-button", component.Markup);
+        }
+
+        [Fact]
+        public void Carousel_Renders_AllowNavigation_True()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenCarousel>(parameters =>
+            {
+                parameters.Add(p => p.AllowNavigation, true);
+            });
+
+            Assert.Contains("rz-carousel-prev", component.Markup);
+            Assert.Contains("rz-carousel-next", component.Markup);
+        }
+
+        [Fact]
+        public void Carousel_Renders_AllowNavigation_False()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenCarousel>(parameters =>
+            {
+                parameters.Add(p => p.AllowNavigation, false);
+            });
+
+            Assert.DoesNotContain("rz-carousel-prev", component.Markup);
+            Assert.DoesNotContain("rz-carousel-next", component.Markup);
+            Assert.Contains("rz-carousel-no-navigation", component.Markup);
+        }
+
+        [Fact]
+        public void Carousel_Renders_PagerPosition_Top()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenCarousel>(parameters =>
+            {
+                parameters.Add(p => p.PagerPosition, PagerPosition.Top);
+                parameters.Add(p => p.AllowPaging, true);
+                parameters.Add(p => p.Items, builder =>
+                {
+                    builder.OpenComponent<RadzenCarouselItem>(0);
+                    builder.AddAttribute(1, "ChildContent", (RenderFragment)(b => b.AddContent(0, "Slide")));
+                    builder.CloseComponent();
+                });
+            });
+
+            Assert.Contains("rz-carousel-pager-top", component.Markup);
+        }
+
+        [Fact]
+        public void Carousel_Renders_PagerPosition_Bottom()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenCarousel>(parameters =>
+            {
+                parameters.Add(p => p.PagerPosition, PagerPosition.Bottom);
+                parameters.Add(p => p.AllowPaging, true);
+                parameters.Add(p => p.Items, builder =>
+                {
+                    builder.OpenComponent<RadzenCarouselItem>(0);
+                    builder.AddAttribute(1, "ChildContent", (RenderFragment)(b => b.AddContent(0, "Slide")));
+                    builder.CloseComponent();
+                });
+            });
+
+            Assert.Contains("rz-carousel-pager-bottom", component.Markup);
+        }
+
+        [Fact]
+        public void Carousel_Renders_PagerPosition_TopAndBottom()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenCarousel>(parameters =>
+            {
+                parameters.Add(p => p.PagerPosition, PagerPosition.TopAndBottom);
+                parameters.Add(p => p.AllowPaging, true);
+                parameters.Add(p => p.Items, builder =>
+                {
+                    builder.OpenComponent<RadzenCarouselItem>(0);
+                    builder.AddAttribute(1, "ChildContent", (RenderFragment)(b => b.AddContent(0, "Slide")));
+                    builder.CloseComponent();
+                });
+            });
+
+            Assert.Contains("rz-carousel-pager-top", component.Markup);
+            Assert.Contains("rz-carousel-pager-bottom", component.Markup);
+        }
+
+        [Fact]
+        public void Carousel_Renders_PagerOverlay_True()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenCarousel>(parameters =>
+            {
+                parameters.Add(p => p.PagerOverlay, true);
+            });
+
+            Assert.Contains("rz-carousel-pager-overlay", component.Markup);
+        }
+
+        [Fact]
+        public void Carousel_Renders_PagerOverlay_False()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenCarousel>(parameters =>
+            {
+                parameters.Add(p => p.PagerOverlay, false);
+            });
+
+            Assert.DoesNotContain("rz-carousel-pager-overlay", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/ChatTests.cs

@@ -0,0 +1,369 @@
+using Bunit;
+using Microsoft.AspNetCore.Components;
+using Microsoft.Extensions.DependencyInjection;
+using Radzen.Blazor;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class ChatTests
+    {
+        [Fact]
+        public void RadzenChat_ShouldRenderWithTitle()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, new List<ChatUser>())
+                .Add(p => p.Messages, new List<ChatMessage>())
+            );
+
+            Assert.Contains("Test Chat", component.Markup);
+        }
+
+        [Fact]
+        public void RadzenChat_ShouldShowEmptyMessageWhenNoMessages()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, new List<ChatUser>())
+                .Add(p => p.Messages, new List<ChatMessage>())
+                .Add(p => p.EmptyMessage, "No messages yet!")
+            );
+
+            Assert.Contains("No messages yet!", component.Markup);
+        }
+
+        [Fact]
+        public void RadzenChat_ShouldDisplayMessages()
+        {
+            var messages = new List<ChatMessage>
+            {
+                new ChatMessage { Content = "Hello", UserId = "user1", Timestamp = DateTime.Now },
+                new ChatMessage { Content = "Hi there!", UserId = "user2", Timestamp = DateTime.Now }
+            };
+
+            var users = new List<ChatUser>
+            {
+                new ChatUser { Id = "user1", Name = "John" },
+                new ChatUser { Id = "user2", Name = "Jane" }
+            };
+
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, users)
+                .Add(p => p.Messages, messages)
+            );
+
+            Assert.Contains("Hello", component.Markup);
+            Assert.Contains("Hi there!", component.Markup);
+        }
+
+        [Fact]
+        public void RadzenChat_ShouldShowUsersInHeader()
+        {
+            var users = new List<ChatUser>
+            {
+                new ChatUser { Id = "user1", Name = "John" },
+                new ChatUser { Id = "user2", Name = "Jane" }
+            };
+
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, users)
+                .Add(p => p.Messages, new List<ChatMessage>())
+                .Add(p => p.ShowUsers, true)
+            );
+
+            Assert.Contains("John", component.Markup);
+            Assert.Contains("Jane", component.Markup);
+        }
+
+        [Fact]
+        public void RadzenChat_ShouldShowUserNamesAboveMessages()
+        {
+            var messages = new List<ChatMessage>
+            {
+                new ChatMessage { Content = "Hello", UserId = "user2", Timestamp = DateTime.Now }
+            };
+
+            var users = new List<ChatUser>
+            {
+                new ChatUser { Id = "user1", Name = "John" },
+                new ChatUser { Id = "user2", Name = "Jane" }
+            };
+
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, users)
+                .Add(p => p.Messages, messages)
+                .Add(p => p.ShowUserNames, true)
+            );
+
+            Assert.Contains("Jane", component.Markup);
+        }
+
+        [Fact]
+        public void RadzenChat_ShouldShowClearButtonWhenEnabled()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, new List<ChatUser>())
+                .Add(p => p.Messages, new List<ChatMessage>())
+                .Add(p => p.ShowClearButton, true)
+            );
+
+            var clearButton = component.Find(".rz-chat-header-clear");
+            Assert.NotNull(clearButton);
+        }
+
+        [Fact]
+        public void RadzenChat_ShouldNotShowClearButtonWhenDisabled()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, new List<ChatUser>())
+                .Add(p => p.Messages, new List<ChatMessage>())
+                .Add(p => p.ShowClearButton, false)
+            );
+
+            var clearButton = component.FindAll(".rz-chat-header-clear");
+            Assert.Empty(clearButton);
+        }
+
+        [Fact]
+        public void RadzenChat_ShouldLimitVisibleUsers()
+        {
+            var users = new List<ChatUser>
+            {
+                new ChatUser { Id = "user1", Name = "John" },
+                new ChatUser { Id = "user2", Name = "Jane" },
+                new ChatUser { Id = "user3", Name = "Bob" },
+                new ChatUser { Id = "user4", Name = "Alice" },
+                new ChatUser { Id = "user5", Name = "Charlie" },
+                new ChatUser { Id = "user6", Name = "David" }
+            };
+
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, users)
+                .Add(p => p.Messages, new List<ChatMessage>())
+                .Add(p => p.ShowUsers, true)
+                .Add(p => p.MaxVisibleUsers, 3)
+            );
+
+            // Should show "+3" for the remaining users
+            Assert.Contains("+3", component.Markup);
+        }
+
+        [Fact]
+        public void RadzenChat_ShouldShowUserMessagesOnRight()
+        {
+            var messages = new List<ChatMessage>
+            {
+                new ChatMessage { Content = "My message", UserId = "user1", Timestamp = DateTime.Now }
+            };
+
+            var users = new List<ChatUser>
+            {
+                new ChatUser { Id = "user1", Name = "John" }
+            };
+
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, users)
+                .Add(p => p.Messages, messages)
+            );
+
+            var userMessage = component.Find(".rz-chat-message-user");
+            Assert.NotNull(userMessage);
+        }
+
+        [Fact]
+        public void RadzenChat_ShouldShowUserMessagesOnLeft()
+        {
+            var messages = new List<ChatMessage>
+            {
+                new ChatMessage { Content = "Other message", UserId = "user2", Timestamp = DateTime.Now }
+            };
+
+            var users = new List<ChatUser>
+            {
+                new ChatUser { Id = "user1", Name = "John" },
+                new ChatUser { Id = "user2", Name = "Jane" }
+            };
+
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, users)
+                .Add(p => p.Messages, messages)
+            );
+
+            var participantMessage = component.Find(".rz-chat-message-participant");
+            Assert.NotNull(participantMessage);
+        }
+
+        [Fact]
+        public void RadzenChat_ShouldShowAvatarInitials()
+        {
+            var users = new List<ChatUser>
+            {
+                new ChatUser { Id = "user1", Name = "John Doe" }
+            };
+
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, users)
+                .Add(p => p.Messages, new List<ChatMessage>())
+                .Add(p => p.ShowUsers, true)
+            );
+
+            Assert.Contains("JD", component.Markup);
+        }
+
+        [Fact]
+        public void RadzenChat_ShouldShowAvatarImageWhenProvided()
+        {
+            var users = new List<ChatUser>
+            {
+                new ChatUser { Id = "user1", Name = "John", AvatarUrl = "https://example.com/avatar.jpg" }
+            };
+
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, users)
+                .Add(p => p.Messages, new List<ChatMessage>())
+                .Add(p => p.ShowUsers, true)
+            );
+
+            var avatarImage = component.Find(".rz-chat-participant-image");
+            Assert.NotNull(avatarImage);
+            Assert.Equal("https://example.com/avatar.jpg", avatarImage.GetAttribute("src"));
+        }
+
+        [Fact]
+        public void RadzenChat_ShouldBeDisabledWhenDisabled()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, new List<ChatUser>())
+                .Add(p => p.Messages, new List<ChatMessage>())
+                .Add(p => p.Disabled, true)
+            );
+
+            var textarea = component.Find(".rz-chat-textarea");
+            Assert.True(textarea.HasAttribute("disabled"));
+        }
+
+        [Fact]
+        public void RadzenChat_ShouldBeReadOnlyWhenReadOnly()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, new List<ChatUser>())
+                .Add(p => p.Messages, new List<ChatMessage>())
+                .Add(p => p.ReadOnly, true)
+            );
+
+            var textarea = component.Find(".rz-chat-textarea");
+            Assert.True(textarea.HasAttribute("readonly"));
+        }
+
+        [Fact]
+        public void RadzenChat_ShouldShowCustomPlaceholder()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, new List<ChatUser>())
+                .Add(p => p.Messages, new List<ChatMessage>())
+                .Add(p => p.Placeholder, "Custom placeholder")
+            );
+
+            var textarea = component.Find(".rz-chat-textarea");
+            Assert.Equal("Custom placeholder", textarea.GetAttribute("placeholder"));
+        }
+
+        [Fact]
+        public void RadzenChat_ShouldShowStreamingIndicator()
+        {
+            var messages = new List<ChatMessage>
+            {
+                new ChatMessage { Content = "Streaming message", UserId = "user1", IsStreaming = true, Timestamp = DateTime.Now }
+            };
+
+            var users = new List<ChatUser>
+            {
+                new ChatUser { Id = "user1", Name = "John" }
+            };
+
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, users)
+                .Add(p => p.Messages, messages)
+            );
+
+            var streamingIcon = component.Find(".rz-chat-message-streaming-icon");
+            Assert.NotNull(streamingIcon);
+        }
+
+        [Fact]
+        public void RadzenChat_ShouldShowMessageTimestamps()
+        {
+            var timestamp = DateTime.Now.AddHours(-1);
+            var messages = new List<ChatMessage>
+            {
+                new ChatMessage { Content = "Test message", UserId = "user1", Timestamp = timestamp }
+            };
+
+            var users = new List<ChatUser>
+            {
+                new ChatUser { Id = "user1", Name = "John" }
+            };
+
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenChat>(parameters => parameters
+                .Add(p => p.Title, "Test Chat")
+                .Add(p => p.CurrentUserId, "user1")
+                .Add(p => p.Users, users)
+                .Add(p => p.Messages, messages)
+            );
+
+            Assert.Contains(timestamp.ToString("HH:mm"), component.Markup);
+        }
+    }
+}

Radzen.Blazor.Tests/CheckBoxListTests.cs

@@ -0,0 +1,168 @@
+using Bunit;
+using Xunit;
+using System.Collections.Generic;
+
+namespace Radzen.Blazor.Tests
+{
+    public class CheckBoxListTests
+    {
+        class Item
+        {
+            public int Id { get; set; }
+            public string Name { get; set; }
+            public bool Disabled { get; set; }
+        }
+
+        [Fact]
+        public void CheckBoxList_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenCheckBoxList<int>>();
+
+            Assert.Contains(@"rz-checkbox-list", component.Markup);
+        }
+
+        [Fact]
+        public void CheckBoxList_Renders_WithData()
+        {
+            using var ctx = new TestContext();
+            var data = new List<string> { "Option 1", "Option 2", "Option 3" };
+
+            var component = ctx.RenderComponent<RadzenCheckBoxList<string>>(parameters =>
+            {
+                parameters.Add(p => p.Data, data);
+            });
+
+            Assert.Contains("Option 1", component.Markup);
+            Assert.Contains("Option 2", component.Markup);
+            Assert.Contains("Option 3", component.Markup);
+        }
+
+        [Fact]
+        public void CheckBoxList_Renders_WithCustomTextValueProperties()
+        {
+            using var ctx = new TestContext();
+            var data = new List<Item>
+            {
+                new Item { Id = 1, Name = "First" },
+                new Item { Id = 2, Name = "Second" }
+            };
+
+            var component = ctx.RenderComponent<RadzenCheckBoxList<int>>(parameters =>
+            {
+                parameters.Add(p => p.Data, data);
+                parameters.Add(p => p.TextProperty, "Name");
+                parameters.Add(p => p.ValueProperty, "Id");
+            });
+
+            Assert.Contains("First", component.Markup);
+            Assert.Contains("Second", component.Markup);
+        }
+
+        [Fact]
+        public void CheckBoxList_Renders_Orientation_Horizontal()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenCheckBoxList<int>>(parameters =>
+            {
+                parameters.Add(p => p.Orientation, Orientation.Horizontal);
+            });
+
+            Assert.Contains("rz-flex-row", component.Markup);
+        }
+
+        [Fact]
+        public void CheckBoxList_Renders_Orientation_Vertical()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenCheckBoxList<int>>(parameters =>
+            {
+                parameters.Add(p => p.Orientation, Orientation.Vertical);
+            });
+
+            Assert.Contains("rz-flex-column", component.Markup);
+        }
+
+        [Fact]
+        public void CheckBoxList_Renders_Disabled()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenCheckBoxList<int>>(parameters =>
+            {
+                parameters.Add(p => p.Disabled, true);
+            });
+
+            Assert.Contains("disabled", component.Markup);
+            Assert.Contains("rz-state-disabled", component.Markup);
+        }
+
+        [Fact]
+        public void CheckBoxList_Renders_AllowSelectAll()
+        {
+            using var ctx = new TestContext();
+            var data = new List<string> { "Option 1", "Option 2" };
+
+            var component = ctx.RenderComponent<RadzenCheckBoxList<string>>(parameters =>
+            {
+                parameters.Add(p => p.AllowSelectAll, true);
+                parameters.Add(p => p.Data, data);
+            });
+
+            Assert.Contains("rz-multiselect-header", component.Markup);
+        }
+
+        [Fact]
+        public void CheckBoxList_Renders_SelectAllText()
+        {
+            using var ctx = new TestContext();
+            var data = new List<string> { "Option 1", "Option 2" };
+
+            var component = ctx.RenderComponent<RadzenCheckBoxList<string>>(parameters =>
+            {
+                parameters.Add(p => p.AllowSelectAll, true);
+                parameters.Add(p => p.SelectAllText, "Select All Options");
+                parameters.Add(p => p.Data, data);
+            });
+
+            Assert.Contains("Select All Options", component.Markup);
+        }
+
+        [Fact]
+        public void CheckBoxList_Renders_CheckboxInputs()
+        {
+            using var ctx = new TestContext();
+            var data = new List<string> { "Option 1", "Option 2" };
+
+            var component = ctx.RenderComponent<RadzenCheckBoxList<string>>(parameters =>
+            {
+                parameters.Add(p => p.Data, data);
+            });
+
+            Assert.Contains("type=\"checkbox\"", component.Markup);
+            Assert.Contains("rz-chkbox", component.Markup);
+        }
+
+        [Fact]
+        public void CheckBoxList_Renders_DisabledItems()
+        {
+            using var ctx = new TestContext();
+            var data = new List<Item>
+            {
+                new Item { Id = 1, Name = "Enabled", Disabled = false },
+                new Item { Id = 2, Name = "Disabled", Disabled = true }
+            };
+
+            var component = ctx.RenderComponent<RadzenCheckBoxList<int>>(parameters =>
+            {
+                parameters.Add(p => p.Data, data);
+                parameters.Add(p => p.TextProperty, "Name");
+                parameters.Add(p => p.ValueProperty, "Id");
+                parameters.Add(p => p.DisabledProperty, "Disabled");
+            });
+
+            Assert.Contains("Enabled", component.Markup);
+            Assert.Contains("Disabled", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/ColumnTests.cs

@@ -0,0 +1,74 @@
+using Bunit;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class ColumnTests
+    {
+        [Fact]
+        public void Column_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenColumn>();
+
+            Assert.Contains(@"rz-col", component.Markup);
+        }
+
+        [Fact]
+        public void Column_Renders_ChildContent()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenColumn>(parameters =>
+            {
+                parameters.AddChildContent("<div>Column Content</div>");
+            });
+
+            Assert.Contains("Column Content", component.Markup);
+        }
+
+        [Fact]
+        public void Column_Renders_SizeParameter()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenColumn>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Size, 6));
+
+            Assert.Contains("rz-col-6", component.Markup);
+        }
+
+        [Fact]
+        public void Column_Renders_SizeMD()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenColumn>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.SizeMD, 4));
+
+            Assert.Contains("rz-col-md-4", component.Markup);
+        }
+
+        [Fact]
+        public void Column_Renders_SizeSM()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenColumn>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.SizeSM, 12));
+
+            Assert.Contains("rz-col-sm-12", component.Markup);
+        }
+
+        [Fact]
+        public void Column_Renders_Offset()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenColumn>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Offset, 2));
+
+            Assert.Contains("rz-offset-2", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/DatePickerTests.cs

@@ -732,5 +732,130 @@ namespace Radzen.Blazor.Tests
             var weekNumberHeader = component.Find(".rz-calendar-view th.rz-datepicker-week-number");
             Assert.Contains("Wk", weekNumberHeader.InnerHtml);
         }
+
+        [Fact]
+        public void DatePicker_Multiple_Selects_IEnumerableDateTime()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            IEnumerable<DateTime> emitted = null;
+            var initial = new DateTime(2024, 1, 1);
+
+            var component = ctx.RenderComponent<RadzenDatePicker<IEnumerable<DateTime>>>(parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.InitialViewDate, initial);
+                parameters.Add(p => p.ValueChanged, args => { emitted = args; });
+            });
+
+            component.InvokeAsync(() => component.FindAll("td:not(.rz-calendar-other-month) span").First(e => e.TextContent == "10").ParentElement.Click());
+            component.InvokeAsync(() => component.FindAll("td:not(.rz-calendar-other-month) span").First(e => e.TextContent == "12").ParentElement.Click());
+
+            Assert.NotNull(emitted);
+            var list = emitted.ToList();
+            Assert.Equal(2, list.Count);
+            Assert.Contains(new DateTime(2024, 1, 10), list.Select(d => d.Date));
+            Assert.Contains(new DateTime(2024, 1, 12), list.Select(d => d.Date));
+        }
+
+        [Fact]
+        public void DatePicker_Multiple_Selects_IEnumerableNullableDateTime()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            IEnumerable<DateTime?> emitted = null;
+            var initial = new DateTime(2024, 2, 1);
+
+            var component = ctx.RenderComponent<RadzenDatePicker<IEnumerable<DateTime?>>>(parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.InitialViewDate, initial);
+                parameters.Add(p => p.ValueChanged, args => { emitted = args; });
+            });
+
+            component.InvokeAsync(() => component.FindAll("td:not(.rz-calendar-other-month) span").First(e => e.TextContent == "3").ParentElement.Click());
+            component.InvokeAsync(() => component.FindAll("td:not(.rz-calendar-other-month) span").First(e => e.TextContent == "14").ParentElement.Click());
+
+            Assert.NotNull(emitted);
+            var list = emitted.ToList();
+            Assert.Equal(2, list.Count);
+            Assert.Contains(new DateTime(2024, 2, 3), list.Select(d => d.Value.Date));
+            Assert.Contains(new DateTime(2024, 2, 14), list.Select(d => d.Value.Date));
+        }
+
+        [Fact]
+        public void DatePicker_Multiple_Emits_IEnumerableDateTimeOffsetNullable_WithUtcKind()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            IEnumerable<DateTimeOffset?> emitted = null;
+            var initial = new DateTime(2024, 3, 1);
+
+            var component = ctx.RenderComponent<RadzenDatePicker<IEnumerable<DateTimeOffset?>>>(parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.InitialViewDate, initial);
+                parameters.Add(p => p.Kind, DateTimeKind.Utc);
+                parameters.Add(p => p.ValueChanged, args => { emitted = args; });
+            });
+
+            component.InvokeAsync(() => component.FindAll("td:not(.rz-calendar-other-month) span").First(e => e.TextContent == "5").ParentElement.Click());
+            component.InvokeAsync(() => component.FindAll("td:not(.rz-calendar-other-month) span").First(e => e.TextContent == "20").ParentElement.Click());
+
+            Assert.NotNull(emitted);
+            var list = emitted.ToList();
+            Assert.Equal(2, list.Count);
+            Assert.All(list, dto => Assert.Equal(TimeSpan.Zero, dto.Value.Offset));
+        }
+
+        [Fact]
+        public void DatePicker_Multiple_Emits_IEnumerableDateOnlyAndTimeOnlyNullable()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            IEnumerable<DateOnly?> emittedDates = null;
+            IEnumerable<TimeOnly?> emittedTimes = null;
+            var initial = new DateTime(2024, 4, 1);
+
+            var compDates = ctx.RenderComponent<RadzenDatePicker<IEnumerable<DateOnly?>>>(parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.InitialViewDate, initial);
+                parameters.Add(p => p.ValueChanged, args => { emittedDates = args; });
+            });
+
+            compDates.InvokeAsync(() => compDates.FindAll("td:not(.rz-calendar-other-month) span").First(e => e.TextContent == "7").ParentElement.Click());
+            compDates.InvokeAsync(() => compDates.FindAll("td:not(.rz-calendar-other-month) span").First(e => e.TextContent == "9").ParentElement.Click());
+
+            Assert.NotNull(emittedDates);
+            var dateList = emittedDates.ToList();
+            Assert.Equal(2, dateList.Count);
+            Assert.Contains(new DateOnly(2024, 4, 7), dateList.Select(d => d.Value));
+            Assert.Contains(new DateOnly(2024, 4, 9), dateList.Select(d => d.Value));
+
+            // TimeOnly? emission should produce midnight times for selected dates
+            var compTimes = ctx.RenderComponent<RadzenDatePicker<IEnumerable<TimeOnly?>>>(parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.InitialViewDate, initial);
+                parameters.Add(p => p.ValueChanged, args => { emittedTimes = args; });
+            });
+
+            compTimes.InvokeAsync(() => compTimes.FindAll("td:not(.rz-calendar-other-month) span").First(e => e.TextContent == "1").ParentElement.Click());
+            compTimes.InvokeAsync(() => compTimes.FindAll("td:not(.rz-calendar-other-month) span").First(e => e.TextContent == "2").ParentElement.Click());
+
+            Assert.NotNull(emittedTimes);
+            var timeList = emittedTimes.ToList();
+            Assert.Equal(2, timeList.Count);
+            Assert.All(timeList, t => Assert.Equal(new TimeOnly(0, 0, 0), t.Value));
+        }
     }
 }

Radzen.Blazor.Tests/DialogServiceTests.cs

@@ -0,0 +1,413 @@
+using Bunit;
+using Microsoft.AspNetCore.Components;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+	public class DialogServiceTests : ComponentBase
+	{
+		public class OpenDialogTests
+		{
+			[Fact(DisplayName = "DialogOptions default values are set correctly")]
+			public void DialogOptions_DefaultValues_AreSetCorrectly()
+			{
+				// Arrange
+				var options = new DialogOptions();
+				var dialogService = new DialogService(null, null);
+
+				// Act
+				dialogService.OpenDialog<DialogServiceTests>("Test", [], options);
+
+				// Assert
+				Assert.Equal("600px", options.Width);
+				Assert.Equal("", options.Left);
+				Assert.Equal("", options.Top);
+				Assert.Equal("", options.Bottom);
+				Assert.Equal("", options.Height);
+				Assert.Equal("", options.Style);
+				Assert.Equal("", options.CssClass);
+				Assert.Equal("", options.WrapperCssClass);
+				Assert.Equal("", options.ContentCssClass);
+			}
+
+			[Fact(DisplayName = "DialogOptions values are retained after OpenDialog call")]
+			public void DialogOptions_Values_AreRetained_AfterOpenDialogCall()
+			{
+				// Arrange
+				var options = new DialogOptions
+				{
+					Width = "800px",
+					Left = "10px",
+					Top = "20px",
+					Bottom = "30px",
+					Height = "400px",
+					Style = "background-color: red;",
+					CssClass = "custom-class",
+					WrapperCssClass = "wrapper-class",
+					ContentCssClass = "content-class"
+				};
+				var dialogService = new DialogService(null, null);
+
+				// Act
+				dialogService.OpenDialog<DialogServiceTests>("Test", [], options);
+
+				// Assert
+				Assert.Equal("800px", options.Width);
+				Assert.Equal("10px", options.Left);
+				Assert.Equal("20px", options.Top);
+				Assert.Equal("30px", options.Bottom);
+				Assert.Equal("400px", options.Height);
+				Assert.Equal("background-color: red;", options.Style);
+				Assert.Equal("custom-class", options.CssClass);
+				Assert.Equal("wrapper-class", options.WrapperCssClass);
+				Assert.Equal("content-class", options.ContentCssClass);
+			}
+
+			[Fact(DisplayName = "DialogOptions is null and default values are set correctly")]
+			public void DialogOptions_IsNull_DefaultValues_AreSetCorrectly()
+			{
+				// Arrange
+				DialogOptions resultingOptions = null;
+				var dialogService = new DialogService(null, null);
+				dialogService.OnOpen += (title, type, parameters, options) => resultingOptions = options;
+
+				// Act
+				dialogService.OpenDialog<DialogServiceTests>("Test", [], null);
+
+				// Assert
+				Assert.NotNull(resultingOptions);
+				Assert.Equal("600px", resultingOptions.Width);
+				Assert.Equal("", resultingOptions.Left);
+				Assert.Equal("", resultingOptions.Top);
+				Assert.Equal("", resultingOptions.Bottom);
+				Assert.Equal("", resultingOptions.Height);
+				Assert.Equal("", resultingOptions.Style);
+				Assert.Equal("", resultingOptions.CssClass);
+				Assert.Equal("", resultingOptions.WrapperCssClass);
+				Assert.Equal("", resultingOptions.ContentCssClass);
+			}
+
+            [Fact(DisplayName = "Open with dynamic component type reflective calls are resolved without exception")]
+            public void Open_DynamicComponentType_Reflective_Calls_Resolve()
+            {
+                // Arrange
+                string resultingTitle = null;
+                Type resultingType = null;
+                var dialogService = new DialogService(null, null);
+                dialogService.OnOpen += (title, type, _, _) =>
+                {
+                    resultingTitle = title;
+                    resultingType = type;
+                };
+                
+                dialogService.Open("Dynamic Open", typeof(RadzenButton), []);
+                
+                // Assert
+                Assert.Equal("Dynamic Open", resultingTitle);
+                Assert.Equal(typeof(RadzenButton), resultingType);
+            }
+            
+            [Fact(DisplayName = "OpenAsync with dynamic component type reflective calls are resolved without exception")]
+            public async Task OpenAsync_DynamicComponentType_Reflective_Calls_Resolve()
+            {
+                // Arrange
+                string resultingTitle = null;
+                Type resultingType = null;
+                var dialogService = new DialogService(null, null);
+                dialogService.OnOpen += (title, type, _, _) =>
+                {
+                    resultingTitle = title;
+                    resultingType = type;
+                };
+
+                var openTask = dialogService.OpenAsync("Dynamic Open", typeof(RadzenButton), []);
+                dialogService.Close();
+                await openTask;
+
+                // Assert
+                Assert.Equal("Dynamic Open", resultingTitle);
+                Assert.Equal(typeof(RadzenButton), resultingType);
+            }
+		}
+
+        public class OpenSideDialogTests
+        {
+            [Fact(DisplayName = "SideDialogOptions resizable option is retained after OpenSideDialog call")]
+            public void SideDialogOptions_Resizable_AreRetained_AfterOpenSideDialogCall()
+            {
+                // Arrange
+                var options = new SideDialogOptions { Resizable = true };
+                SideDialogOptions resultingOptions = null;
+                var dialogService = new DialogService(null, null);
+                dialogService.OnSideOpen += (_, _, sideOptions) => resultingOptions = sideOptions;
+
+                // Act
+                dialogService.OpenSide<DialogServiceTests>("Test", [], options);
+
+                // Assert
+                Assert.NotNull(resultingOptions);
+                Assert.Same(options, resultingOptions);
+                Assert.True(resultingOptions.Resizable);
+            }
+
+            [Fact(DisplayName = "Side dialog shows resize bar when Resizable is true")]
+            public void SideDialog_Resizable_ShowsResizeBar()
+            {
+                using var ctx = new TestContext();
+                ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+                ctx.Services.AddScoped<DialogService>();
+
+                // Render the dialog host
+                var cut = ctx.RenderComponent<RadzenDialog>();
+
+                // Open a side dialog with Resizable=true
+                var dialogService = ctx.Services.GetRequiredService<DialogService>();
+                cut.InvokeAsync(() => dialogService.OpenSide("Test", typeof(RadzenButton),
+                    new Dictionary<string, object>(), new SideDialogOptions { Resizable = true }));
+
+                // Assert: the resize bar element is present
+                cut.WaitForAssertion(() =>
+                {
+                    var markup = cut.Markup;
+                    Assert.Contains("rz-dialog-resize-bar", markup);
+                    // Optionally ensure the inner handle exists too
+                    Assert.Contains("rz-resize", markup);
+                });
+            }
+
+            [Fact(DisplayName = "Side dialog hides resize bar when Resizable is false")]
+            public void SideDialog_NonResizable_HidesResizeBar()
+            {
+                using var ctx = new TestContext();
+                ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+                ctx.Services.AddScoped<DialogService>();
+
+                // Render the dialog host
+                var cut = ctx.RenderComponent<RadzenDialog>();
+
+                // Open a side dialog with Resizable=false
+                var dialogService = ctx.Services.GetRequiredService<DialogService>();
+                cut.InvokeAsync(() => dialogService.OpenSide("Test", typeof(RadzenButton),
+                    new Dictionary<string, object>(), new SideDialogOptions()));
+
+                // Assert: the resize bar element is not present
+                cut.WaitForAssertion(() =>
+                {
+                    var markup = cut.Markup;
+                    Assert.DoesNotContain("rz-dialog-resize-bar", markup);
+                });
+            }
+        }
+		public class ConfirmTests
+		{
+			[Fact(DisplayName = "ConfirmOptions is null and default values are set correctly")]
+			public async Task ConfirmOptions_IsNull_AreSetCorrectly()
+			{
+				// Arrange
+				var dialogService = new DialogService(null, null);
+				ConfirmOptions resultingOptions = null;
+				dialogService.OnOpen += (title, type, parameters, options) => resultingOptions = options as ConfirmOptions;
+
+				using var cancellationTokenSource = new CancellationTokenSource();
+				cancellationTokenSource.Cancel();
+
+				// Act
+				try
+				{
+					await dialogService.Confirm(cancellationToken: cancellationTokenSource.Token);
+				}
+				catch (TaskCanceledException)
+				{
+					// this is expected
+				}
+
+				// Assert
+				Assert.NotNull(resultingOptions);
+                Assert.Equal("Ok", resultingOptions.OkButtonText);
+                Assert.Equal("Cancel", resultingOptions.CancelButtonText);
+                Assert.Equal("600px", resultingOptions.Width);
+				Assert.Equal("", resultingOptions.Style);
+				Assert.Equal("rz-dialog-confirm", resultingOptions.CssClass);
+				Assert.Equal("rz-dialog-wrapper", resultingOptions.WrapperCssClass);
+			}
+
+			[Fact(DisplayName = "ConfirmOptions default values are set correctly")]
+			public async Task ConfirmOptions_DefaultValues_AreSetCorrectly()
+			{
+				// Arrange
+				var dialogService = new DialogService(null, null);
+				ConfirmOptions resultingOptions = null;
+				dialogService.OnOpen += (title, type, parameters, options) => resultingOptions = options as ConfirmOptions;
+
+				using var cancellationTokenSource = new CancellationTokenSource();
+				cancellationTokenSource.Cancel();
+
+				// Act
+				try
+				{
+					await dialogService.Confirm(options: new(), cancellationToken: cancellationTokenSource.Token);
+				}
+				catch (TaskCanceledException)
+				{
+					// this is expected
+				}
+
+				// Assert
+				Assert.NotNull(resultingOptions);
+                Assert.Equal("Ok", resultingOptions.OkButtonText);
+                Assert.Equal("Cancel", resultingOptions.CancelButtonText);
+                Assert.Equal("600px", resultingOptions.Width);
+				Assert.Equal("", resultingOptions.Style);
+				Assert.Equal("rz-dialog-confirm", resultingOptions.CssClass);
+				Assert.Equal("rz-dialog-wrapper", resultingOptions.WrapperCssClass);
+			}
+			[Fact(DisplayName = "ConfirmOptions values are retained after Confirm call")]
+			public async Task Confirm_ProvidedValues_AreRetained()
+			{
+				// Arrange
+				var dialogService = new DialogService(null, null);
+				var options = new ConfirmOptions
+				{
+                    OkButtonText = "XXX",
+                    CancelButtonText = "YYY",
+                    Width = "800px",
+					Style = "background-color: red;",
+					CssClass = "custom-class",
+					WrapperCssClass = "wrapper-class"
+				};
+				ConfirmOptions resultingOptions = null;
+				dialogService.OnOpen += (title, type, parameters, options) => resultingOptions = options as ConfirmOptions;
+
+				// We break out of the dialog immediately, but the options should still be set
+				using var cancellationTokenSource = new CancellationTokenSource();
+				cancellationTokenSource.Cancel();
+
+				// Act
+				try
+				{
+					await dialogService.Confirm("Confirm?", "Confirm", options, cancellationToken: cancellationTokenSource.Token);
+				}
+				catch (TaskCanceledException)
+				{
+					// this is expected
+				}
+
+				// Assert
+				Assert.NotNull(resultingOptions);
+                Assert.Equal("XXX", resultingOptions.OkButtonText);
+                Assert.Equal("YYY", resultingOptions.CancelButtonText);
+                Assert.Equal("800px", resultingOptions.Width);
+				Assert.Equal("background-color: red;", resultingOptions.Style);
+				Assert.Equal("rz-dialog-confirm custom-class", resultingOptions.CssClass);
+				Assert.Equal("rz-dialog-wrapper wrapper-class", resultingOptions.WrapperCssClass);
+			}
+
+		}
+
+		public class AlertTests
+		{
+			[Fact(DisplayName = "AlertOptions is null and default values are set correctly")]
+			public async Task AlertOptions_IsNull_AreSetCorrectly()
+			{
+				// Arrange
+				var dialogService = new DialogService(null, null);
+				AlertOptions resultingOptions = null;
+				dialogService.OnOpen += (title, type, parameters, options) => resultingOptions = options as AlertOptions;
+
+				using var cancellationTokenSource = new CancellationTokenSource();
+				cancellationTokenSource.Cancel();
+
+				// Act
+				try
+				{
+					await dialogService.Alert(cancellationToken: cancellationTokenSource.Token);
+				}
+				catch (TaskCanceledException)
+				{
+					// this is expected
+				}
+
+				// Assert
+				Assert.NotNull(resultingOptions);
+                Assert.Equal("Ok", resultingOptions.OkButtonText);
+				Assert.Equal("600px", resultingOptions.Width);
+				Assert.Equal("", resultingOptions.Style);
+				Assert.Equal("rz-dialog-alert", resultingOptions.CssClass);
+				Assert.Equal("rz-dialog-wrapper", resultingOptions.WrapperCssClass);
+			}
+
+			[Fact(DisplayName = "AlertOptions default values are set correctly")]
+			public async Task AlertOptions_DefaultValues_AreSetCorrectly()
+			{
+				// Arrange
+				var dialogService = new DialogService(null, null);
+				AlertOptions resultingOptions = null;
+				dialogService.OnOpen += (title, type, parameters, options) => resultingOptions = options as AlertOptions;
+
+				using var cancellationTokenSource = new CancellationTokenSource();
+				cancellationTokenSource.Cancel();
+
+				// Act
+				try
+				{
+					await dialogService.Alert(options: new(), cancellationToken: cancellationTokenSource.Token);
+				}
+				catch (TaskCanceledException)
+				{
+					// this is expected
+				}
+
+				// Assert
+				Assert.NotNull(resultingOptions);
+                Assert.Equal("Ok", resultingOptions.OkButtonText);
+				Assert.Equal("600px", resultingOptions.Width);
+				Assert.Equal("", resultingOptions.Style);
+				Assert.Equal("rz-dialog-alert", resultingOptions.CssClass);
+				Assert.Equal("rz-dialog-wrapper", resultingOptions.WrapperCssClass);
+			}
+			[Fact(DisplayName = "AlertOptions values are retained after Alert call")]
+			public async Task Alert_ProvidedValues_AreRetained()
+			{
+				// Arrange
+				var dialogService = new DialogService(null, null);
+				var options = new AlertOptions
+				{
+                    OkButtonText = "XXX",
+					Width = "800px",
+					Style = "background-color: red;",
+					CssClass = "custom-class",
+					WrapperCssClass = "wrapper-class"
+				};
+				AlertOptions resultingOptions = null;
+				dialogService.OnOpen += (title, type, parameters, options) => resultingOptions = options as AlertOptions;
+
+				// We break out of the dialog immediately, but the options should still be set
+				using var cancellationTokenSource = new CancellationTokenSource();
+				cancellationTokenSource.Cancel();
+
+				// Act
+				try
+				{
+					await dialogService.Alert("Alert?", "Alert", options, cancellationToken: cancellationTokenSource.Token);
+				}
+				catch (TaskCanceledException)
+				{
+					// this is expected
+				}
+
+				// Assert
+				Assert.NotNull(resultingOptions);
+				Assert.Equal("XXX", resultingOptions.OkButtonText);
+				Assert.Equal("800px", resultingOptions.Width);
+				Assert.Equal("background-color: red;", resultingOptions.Style);
+				Assert.Equal("rz-dialog-alert custom-class", resultingOptions.CssClass);
+				Assert.Equal("rz-dialog-wrapper wrapper-class", resultingOptions.WrapperCssClass);
+			}
+		}
+	}
+}

Radzen.Blazor.Tests/DropDownDataGridTests.cs

@@ -0,0 +1,289 @@
+using Bunit;
+using Xunit;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Radzen.Blazor.Tests
+{
+    public class DropDownDataGridTests
+    {
+        class Customer
+        {
+            public int Id { get; set; }
+            public string CompanyName { get; set; }
+            public string ContactName { get; set; }
+        }
+
+        [Fact]
+        public void DropDownDataGrid_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<int>>();
+
+            Assert.Contains(@"rz-dropdown", component.Markup);
+        }
+
+        [Fact]
+        public void DropDownDataGrid_Renders_DropdownTrigger()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<int>>();
+
+            Assert.Contains("rz-dropdown-trigger", component.Markup);
+            Assert.Contains("rzi-chevron-down", component.Markup);
+        }
+
+        [Fact]
+        public void DropDownDataGrid_Renders_WithData()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<string> { "Item1", "Item2", "Item3" };
+
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<string>>(parameters =>
+            {
+                parameters.Add(p => p.Data, data);
+            });
+
+            Assert.Contains("rz-lookup-panel", component.Markup);
+        }
+
+        [Fact]
+        public void DropDownDataGrid_Renders_WithCustomTextValueProperties()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<Customer>
+            {
+                new Customer { Id = 1, CompanyName = "Acme Corp", ContactName = "John Doe" },
+                new Customer { Id = 2, CompanyName = "Tech Inc", ContactName = "Jane Smith" }
+            };
+
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<int>>(parameters =>
+            {
+                parameters.Add(p => p.Data, data);
+                parameters.Add(p => p.TextProperty, "CompanyName");
+                parameters.Add(p => p.ValueProperty, "Id");
+            });
+
+            Assert.Contains("rz-lookup-panel", component.Markup);
+            Assert.Contains("rz-data-grid", component.Markup);
+        }
+
+        [Fact]
+        public void DropDownDataGrid_Renders_DataGrid()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<string> { "Item1" };
+
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<string>>(parameters =>
+            {
+                parameters.Add(p => p.Data, data);
+            });
+
+            // DropDownDataGrid embeds a DataGrid
+            Assert.Contains("rz-data-grid", component.Markup);
+        }
+
+        [Fact]
+        public void DropDownDataGrid_Renders_AllowFiltering()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<string> { "Item1", "Item2" };
+
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<string>>(parameters =>
+            {
+                parameters.Add(p => p.AllowFiltering, true);
+                parameters.Add(p => p.Data, data);
+            });
+
+            Assert.Contains("rz-lookup-search", component.Markup);
+            Assert.Contains("rz-lookup-search-input", component.Markup);
+        }
+
+        [Fact]
+        public void DropDownDataGrid_Renders_Placeholder()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<int>>(parameters =>
+            {
+                parameters.Add(p => p.Placeholder, "Select an item");
+            });
+
+            Assert.Contains("Select an item", component.Markup);
+            Assert.Contains("rz-placeholder", component.Markup);
+        }
+
+        [Fact]
+        public void DropDownDataGrid_Renders_AllowClear_WithValue()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<string> { "Item1" };
+
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<string>>(parameters =>
+            {
+                parameters.Add(p => p.AllowClear, true);
+                parameters.Add(p => p.Data, data);
+                parameters.Add(p => p.Value, "Item1");
+            });
+
+            Assert.Contains("rz-dropdown-clear-icon", component.Markup);
+        }
+
+        [Fact]
+        public void DropDownDataGrid_DoesNotRender_AllowClear_WhenNotAllowed()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<string> { "Item1" };
+
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<string>>(parameters =>
+            {
+                parameters.Add(p => p.AllowClear, false);
+                parameters.Add(p => p.Data, data);
+                parameters.Add(p => p.Value, "Item1");
+            });
+
+            Assert.DoesNotContain("rz-dropdown-clear-icon", component.Markup);
+        }
+
+        [Fact]
+        public void DropDownDataGrid_Renders_Disabled()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<int>>(parameters =>
+            {
+                parameters.Add(p => p.Disabled, true);
+            });
+
+            Assert.Contains("disabled", component.Markup);
+            Assert.Contains("rz-state-disabled", component.Markup);
+        }
+
+        [Fact]
+        public void DropDownDataGrid_Renders_Multiple_Panel()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<IEnumerable<int>>>(parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+            });
+
+            Assert.Contains("rz-multiselect-panel", component.Markup);
+        }
+
+        [Fact]
+        public void DropDownDataGrid_Renders_Multiple_WithChips()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<string> { "Item1", "Item2" };
+            var selectedItems = new List<string> { "Item1" };
+
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<IEnumerable<string>>>(parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.Chips, true);
+                parameters.Add(p => p.Data, data);
+                parameters.Add(p => p.Value, selectedItems);
+            });
+
+            Assert.Contains("rz-dropdown-chips-wrapper", component.Markup);
+            Assert.Contains("rz-chip", component.Markup);
+        }
+
+        [Fact]
+        public void DropDownDataGrid_Renders_AllowSorting()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<Customer>
+            {
+                new Customer { Id = 1, CompanyName = "Acme" }
+            };
+
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<int>>(parameters =>
+            {
+                parameters.Add(p => p.AllowSorting, true);
+                parameters.Add(p => p.Data, data);
+                parameters.Add(p => p.TextProperty, "CompanyName");
+            });
+
+            Assert.Contains("rz-data-grid", component.Markup);
+        }
+
+        [Fact]
+        public void DropDownDataGrid_Renders_SearchTextPlaceholder()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<string> { "Item1" };
+
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<string>>(parameters =>
+            {
+                parameters.Add(p => p.AllowFiltering, true);
+                parameters.Add(p => p.SearchTextPlaceholder, "Type to filter...");
+                parameters.Add(p => p.Data, data);
+            });
+
+            Assert.Contains("placeholder=\"Type to filter...\"", component.Markup);
+        }
+
+        [Fact]
+        public void DropDownDataGrid_Renders_EmptyText()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<string>>(parameters =>
+            {
+                parameters.Add(p => p.Data, new List<string>());
+                parameters.Add(p => p.EmptyText, "No items found");
+            });
+
+            Assert.Contains("No items found", component.Markup);
+        }
+
+        [Fact]
+        public void DropDownDataGrid_Renders_PageSize()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = Enumerable.Range(1, 20).Select(i => $"Item {i}").ToList();
+
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<string>>(parameters =>
+            {
+                parameters.Add(p => p.Data, data);
+                parameters.Add(p => p.PageSize, 10);
+            });
+
+            // DataGrid with paging should be present
+            Assert.Contains("rz-data-grid", component.Markup);
+        }
+
+        [Fact]
+        public void DropDownDataGrid_Renders_AllowRowSelectOnRowClick()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<string> { "Item1", "Item2" };
+
+            var component = ctx.RenderComponent<RadzenDropDownDataGrid<string>>(parameters =>
+            {
+                parameters.Add(p => p.AllowRowSelectOnRowClick, true);
+                parameters.Add(p => p.Data, data);
+            });
+
+            Assert.Contains("rz-data-grid", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/DropDownTests.cs

@@ -1,10 +1,11 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 using AngleSharp.Dom;
 using Bunit;
 using Microsoft.AspNetCore.Components;
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
 using Xunit;
 
 namespace Radzen.Blazor.Tests
@@ -15,7 +16,7 @@ namespace Radzen.Blazor.Tests
         {
             public string Text { get; set; }
             public int Id { get; set; }
-            public bool Disabled { get; set; } = false;
+            public bool Disabled { get; set; }
         }
 
         private static IRenderedComponent<RadzenDropDown<T>> DropDown<T>(TestContext ctx, Action<ComponentParameterCollectionBuilder<RadzenDropDown<T>>> configure = null)
@@ -45,6 +46,7 @@ namespace Radzen.Blazor.Tests
             return component;
         }
 
+
         [Fact]
         public async Task Dropdown_SelectItem_Method_Should_Not_Throw()
         {
@@ -127,7 +129,7 @@ namespace Radzen.Blazor.Tests
 
             List<DataItem> boundCollection = [new() { Text = "Item 2" }];
 
-            var component = DropDown<string>(ctx, parameters =>
+            var component = DropDown<List<DataItem>>(ctx, parameters =>
             {
                 parameters.Add(p => p.ItemComparer, new DataItemComparer());
                 parameters.Add(p => p.Multiple, true);
@@ -307,7 +309,7 @@ namespace Radzen.Blazor.Tests
                 selectedValues.Add(data[1].Id);
             }
 
-            var component = ctx.RenderComponent<RadzenDropDown<DataItem>>(parameters => parameters
+            var component = ctx.RenderComponent<RadzenDropDown<List<int>>>(parameters => parameters
                .Add(p => p.Data, data)
                .Add(p => p.Value, selectedValues)
                .Add(p => p.Multiple, true)
@@ -326,6 +328,321 @@ namespace Radzen.Blazor.Tests
             Assert.Equal(expectedAriaCheckedValue, selectAllCheckBox.GetAttribute("aria-checked"));
         }
 
+        [Fact]
+        public void DropDown_ReferenceGenericCollectionAssignment_HashSet_ReferencesInstance()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            var originalHashSet = new HashSet<int>();
+            var capturedValue = (HashSet<int>)null;
+
+            var component = DropDownWithReferenceCollection<HashSet<int>>(ctx, parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.Value, originalHashSet);
+                parameters.Add(p => p.ValueChanged, EventCallback.Factory.Create<HashSet<int>>(this, value => capturedValue = value));
+                parameters.Add(p => p.ValueProperty, nameof(DataItem.Id));
+            });
+
+            var items = component.FindAll(".rz-multiselect-item");
+            
+            // Select first item
+            items[0].Click();
+            component.Render();
+
+            // Verify the same HashSet instance is Referenced
+            Assert.Same(originalHashSet, capturedValue);
+            
+            // Verify the item was added correctly
+            Assert.Single(originalHashSet);
+            Assert.Contains(1, originalHashSet);
+        }
+
+        [Fact]
+        public void DropDown_ReferenceGenericCollectionAssignment_HashSet_MultipleSelections()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            var originalHashSet = new HashSet<int> { 2 }; // Pre-populate with Item 2
+            var capturedValues = new List<HashSet<int>>();
+
+            var component = DropDownWithReferenceCollection<HashSet<int>>(ctx, parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.Value, originalHashSet);
+                parameters.Add(p => p.ValueChanged, EventCallback.Factory.Create<HashSet<int>>(this, value => capturedValues.Add(value)));
+                parameters.Add(p => p.ValueProperty, nameof(DataItem.Id));
+            });
+
+            var items = component.FindAll(".rz-multiselect-item");
+            
+            // Select first item (should add to existing collection)
+            items[0].Click();
+            component.Render();
+
+            // Verify the same HashSet instance is Referenced
+            Assert.Single(capturedValues);
+            Assert.Same(originalHashSet, capturedValues[0]);
+            
+            // Verify both items are now in the collection
+            Assert.Equal(2, originalHashSet.Count);
+            Assert.Contains(1, originalHashSet);
+            Assert.Contains(2, originalHashSet);
+
+            // Deselect second item (should remove from collection)
+            items = component.FindAll(".rz-multiselect-item"); // Re-find items after render
+            items[1].Click();
+            component.Render();
+
+            // Verify the same HashSet instance is still Referenced
+            Assert.Equal(2, capturedValues.Count);
+            Assert.Same(originalHashSet, capturedValues[1]);
+            
+            // Verify only first item remains
+            Assert.Single(originalHashSet);
+            Assert.Contains(1, originalHashSet);
+            Assert.DoesNotContain(2, originalHashSet);
+        }
+
+        [Fact]
+        public void DropDown_ReferenceGenericCollectionAssignment_SortedSet_ReferencesInstance()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            var originalSortedSet = new SortedSet<int>();
+            var capturedValue = (SortedSet<int>)null;
+
+            var component = DropDownWithReferenceCollection<SortedSet<int>>(ctx, parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.Value, originalSortedSet);
+                parameters.Add(p => p.ValueChanged, EventCallback.Factory.Create<SortedSet<int>>(this, value => capturedValue = value));
+                parameters.Add(p => p.ValueProperty, nameof(DataItem.Id));
+            });
+
+            var items = component.FindAll(".rz-multiselect-item");
+            
+            // Select both items
+            items[0].Click();
+            component.Render();
+            items = component.FindAll(".rz-multiselect-item"); // Re-find items after first click
+            items[1].Click();
+            component.Render();
+
+            // Verify the same SortedSet instance is Referenced
+            Assert.Same(originalSortedSet, capturedValue);
+            
+            // Verify items are sorted correctly
+            Assert.Equal(2, originalSortedSet.Count);
+            var sortedItems = originalSortedSet.ToList();
+            Assert.Equal(1, sortedItems[0]);
+            Assert.Equal(2, sortedItems[1]);
+        }
+
+        [Fact]
+        public void DropDown_ReferenceGenericCollectionAssignment_CustomCollection_ReferencesInstance()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            var originalCollection = new CustomCollection<int>();
+            var capturedValue = (CustomCollection<int>)null;
+
+            var component = DropDownWithReferenceCollection<CustomCollection<int>>(ctx, parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.Value, originalCollection);
+                parameters.Add(p => p.ValueChanged, EventCallback.Factory.Create<CustomCollection<int>>(this, value => capturedValue = value));
+                parameters.Add(p => p.ValueProperty, nameof(DataItem.Id));
+            });
+
+            var items = component.FindAll(".rz-multiselect-item");
+            
+            // Select first item
+            items[0].Click();
+            component.Render();
+
+            // Verify the same custom collection instance is Referenced
+            Assert.Same(originalCollection, capturedValue);
+            
+            // Verify the item was added correctly
+            Assert.Single(originalCollection);
+            Assert.Contains(1, originalCollection);
+        }
+
+
+        [Fact]
+        public void DropDown_ReferenceGenericCollectionAssignment_List_ReferencesInstance()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            var originalList = new List<int>();
+            var capturedValue = (List<int>)null;
+
+            var component = DropDownWithReferenceCollection<List<int>>(ctx, parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.Value, originalList);
+                parameters.Add(p => p.ValueChanged, EventCallback.Factory.Create<List<int>>(this, value => capturedValue = value));
+                parameters.Add(p => p.ValueProperty, nameof(DataItem.Id));
+            });
+
+            var items = component.FindAll(".rz-multiselect-item");
+            
+            // Select first item
+            items[0].Click();
+            component.Render();
+
+            // For List<T>, it should now Reference the instance since we removed the IList exclusion
+            // Arrays are now excluded instead
+            Assert.Same(originalList, capturedValue);
+            
+            // And the content should be correct
+            Assert.Single(capturedValue);
+            Assert.Contains(1, capturedValue);
+        }
+
+        [Fact]
+        public void DropDown_ReferenceGenericCollectionAssignment_DisabledByDefault()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            var originalList = new List<int>();
+            var capturedValue = (List<int>)null;
+
+            var component = DropDown<List<int>>(ctx, parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.Value, originalList);
+                parameters.Add(p => p.ValueChanged, EventCallback.Factory.Create<List<int>>(this, value => capturedValue = value));
+                parameters.Add(p => p.ValueProperty, nameof(DataItem.Id));
+            });
+
+            var items = component.FindAll(".rz-multiselect-item");
+            
+            // Select first item
+            items[0].Click();
+            component.Render();
+
+            // When ReferenceCollectionOnSelection is false (default), a new instance should be created
+            Assert.NotSame(originalList, capturedValue);
+            
+            // But the content should still be correct
+            Assert.Single(capturedValue);
+            Assert.Contains(1, capturedValue);
+        }
+
+        [Fact]
+        public void DropDown_Reset_PreservesCollectionInstanceButClears()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            var originalHashSet = new HashSet<int> { 1, 2 }; // Pre-populate
+            var capturedValues = new List<HashSet<int>>();
+
+            var component = DropDownWithReferenceCollection<HashSet<int>>(ctx, parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.Value, originalHashSet);
+                parameters.Add(p => p.ValueChanged, EventCallback.Factory.Create<HashSet<int>>(this, value => capturedValues.Add(value)));
+                parameters.Add(p => p.ValueProperty, nameof(DataItem.Id));
+            });
+
+            // Verify initial state - collection should have 2 items
+            Assert.Equal(2, originalHashSet.Count);
+            Assert.Contains(1, originalHashSet);
+            Assert.Contains(2, originalHashSet);
+
+            // Call Reset (public method that calls ClearAll internally)
+            component.InvokeAsync(() => component.Instance.Reset());
+            component.Render();
+
+            // Verify the same HashSet instance is preserved
+            Assert.Single(capturedValues);
+            Assert.Same(originalHashSet, capturedValues[0]);
+            
+            // Verify the collection is now cleared
+            Assert.Empty(originalHashSet);
+        }
+
+        [Fact]
+        public void DropDown_SelectAll_PreservesCollectionInstanceAndPopulates()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            var originalHashSet = new HashSet<int>(); // Start empty
+            var capturedValues = new List<HashSet<int>>();
+
+            var component = DropDownWithReferenceCollection<HashSet<int>>(ctx, parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.AllowSelectAll, true);
+                parameters.Add(p => p.Value, originalHashSet);
+                parameters.Add(p => p.ValueChanged, EventCallback.Factory.Create<HashSet<int>>(this, value => capturedValues.Add(value)));
+                parameters.Add(p => p.ValueProperty, nameof(DataItem.Id));
+            });
+
+            // Verify initial state - collection should be empty
+            Assert.Empty(originalHashSet);
+
+            // Find and click the "Select All" checkbox
+            var selectAllCheckBox = component.Find(".rz-multiselect-header input[type='checkbox']");
+            selectAllCheckBox.Click();
+            component.Render();
+
+            // Verify the same HashSet instance is preserved
+            Assert.Single(capturedValues);
+            Assert.Same(originalHashSet, capturedValues[0]);
+            
+            // Verify the collection now contains both items
+            Assert.Equal(2, originalHashSet.Count);
+            Assert.Contains(1, originalHashSet);
+            Assert.Contains(2, originalHashSet);
+        }
+
+        class ReferenceCollectionDropDown<T> : Radzen.Blazor.RadzenDropDown<T>
+        {
+            protected override void OnInitialized()
+            {
+                PreserveCollectionOnSelection = true;
+                base.OnInitialized();
+            }
+        }
+
+        private static IRenderedComponent<ReferenceCollectionDropDown<T>> DropDownWithReferenceCollection<T>(TestContext ctx, Action<ComponentParameterCollectionBuilder<ReferenceCollectionDropDown<T>>> configure = null)
+        {
+            var data = new[] {
+                new DataItem { Text = "Item 1", Id = 1 },
+                new DataItem { Text = "Item 2", Id = 2 },
+            };
+
+            var component = ctx.RenderComponent<ReferenceCollectionDropDown<T>>();
+
+            component.SetParametersAndRender(parameters =>
+            {
+                parameters.Add(p => p.Data, data);
+                parameters.Add(p => p.TextProperty, nameof(DataItem.Text));
+
+                if (configure != null)
+                {
+                    configure.Invoke(parameters);
+                }
+                else
+                {
+                    parameters.Add(p => p.ValueProperty, nameof(DataItem.Id));
+                }
+            });
+
+            return component;
+        }
+
         class DataItemComparer : IEqualityComparer<DataItem>, IEqualityComparer<object>
         {
             public bool Equals(DataItem x, DataItem y)
@@ -353,5 +670,74 @@ namespace Radzen.Blazor.Tests
 
             }
         }
+
+        class CustomCollection<T> : ICollection<T>
+        {
+            private readonly List<T> _items = new();
+
+            public int Count => _items.Count;
+            public bool IsReadOnly => false;
+
+            public void Add(T item) => _items.Add(item);
+            public void Clear() => _items.Clear();
+            public bool Contains(T item) => _items.Contains(item);
+            public void CopyTo(T[] array, int arrayIndex) => _items.CopyTo(array, arrayIndex);
+            public bool Remove(T item) => _items.Remove(item);
+            public IEnumerator<T> GetEnumerator() => _items.GetEnumerator();
+            IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+        }
+
+        [Fact]
+        public void DropDown_Renders_Placeholder()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            var component = ctx.RenderComponent<RadzenDropDown<int>>(parameters =>
+            {
+                parameters.Add(p => p.Placeholder, "Select an option");
+            });
+
+            Assert.Contains("Select an option", component.Markup);
+            Assert.Contains("rz-placeholder", component.Markup);
+        }
+
+        [Fact]
+        public void DropDown_Renders_AllowClear_WithValue()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new[] { new DataItem { Text = "Item 1", Id = 1 } };
+
+            var component = ctx.RenderComponent<RadzenDropDown<int>>(parameters =>
+            {
+                parameters.Add(p => p.AllowClear, true);
+                parameters.Add(p => p.Data, data);
+                parameters.Add(p => p.TextProperty, nameof(DataItem.Text));
+                parameters.Add(p => p.ValueProperty, nameof(DataItem.Id));
+                parameters.Add(p => p.Value, 1);
+            });
+
+            Assert.Contains("rz-dropdown-clear-icon", component.Markup);
+        }
+
+        [Fact]
+        public void DropDown_DoesNotRender_AllowClear_WhenNotAllowed()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new[] { new DataItem { Text = "Item 1", Id = 1 } };
+
+            var component = ctx.RenderComponent<RadzenDropDown<int>>(parameters =>
+            {
+                parameters.Add(p => p.AllowClear, false);
+                parameters.Add(p => p.Data, data);
+                parameters.Add(p => p.TextProperty, nameof(DataItem.Text));
+                parameters.Add(p => p.ValueProperty, nameof(DataItem.Id));
+                parameters.Add(p => p.Value, 1);
+            });
+
+            Assert.DoesNotContain("rz-dropdown-clear-icon", component.Markup);
+        }
     }
 }

Radzen.Blazor.Tests/ExpressionSerializerTests.cs

@@ -0,0 +1,323 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Linq.Expressions;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    class TestEntity
+    {
+        public string Name { get; set; }
+        public int Age { get; set; }
+        public double Salary { get; set; }
+        public float Score { get; set; }
+        public decimal Balance { get; set; }
+        public short Level { get; set; }
+        public long Population { get; set; }
+        public Status AccountStatus { get; set; }
+        public DateTime CreatedAt { get; set; }
+        public DateTimeOffset LastUpdated { get; set; }
+        public Guid Id { get; set; }
+        public TimeOnly StartTime { get; set; }
+        public DateOnly BirthDate { get; set; }
+        public IEnumerable<int> Scores { get; set; }
+        public List<string> Tags { get; set; }
+        public List<TestEntity> Children { get; set; }
+        public Address Address { get; set; }
+        public double[] Salaries { get; set; }
+        public float[] Heights { get; set; }
+        public decimal[] Balances { get; set; }
+        public short[] Levels { get; set; }
+        public long[] Populations { get; set; }
+        public string[] Names { get; set; }
+        public Guid[] Ids { get; set; }
+        public DateTime[] CreatedDates { get; set; }
+        public DateTimeOffset[] UpdatedDates { get; set; }
+        public TimeOnly[] StartTimes { get; set; }
+        public DateOnly[] BirthDates { get; set; }
+        public Status[] Statuses { get; set; }
+    }
+
+    enum Status
+    {
+        Active,
+        Inactive,
+        Suspended
+    }
+
+    class Address
+    {
+        public string City { get; set; }
+        public string Country { get; set; }
+    }
+
+    public class ExpressionSerializerTests
+    {
+        private readonly ExpressionSerializer _serializer = new ExpressionSerializer();
+
+        [Fact]
+        public void Serializes_SimpleBinaryExpression()
+        {
+            Expression<Func<int, bool>> expr = e => e > 10;
+            Assert.Equal("e => (e > 10)", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_StringEquality()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => e.Name == "John";
+            Assert.Equal("e => (e.Name == \"John\")", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_IntComparison()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => e.Age > 18;
+            Assert.Equal("e => (e.Age > 18)", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_DoubleComparison()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => e.Salary < 50000.50;
+            Assert.Equal("e => (e.Salary < 50000.5)", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_FloatComparison()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => e.Score >= 85.3f;
+            Assert.Equal("e => (e.Score >= 85.3)", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_DecimalComparison()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => e.Balance <= 1000.75m;
+            Assert.Equal("e => (e.Balance <= 1000.75)", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_ShortComparison()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => e.Level == 3;
+            Assert.Equal("e => (e.Level == 3)", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_LongComparison()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => e.Population > 1000000L;
+            Assert.Equal("e => (e.Population > 1000000)", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_EnumComparison()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => e.AccountStatus == Status.Inactive;
+            Assert.Equal("e => (e.AccountStatus == 1)", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_ArrayContainsValue()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => e.Scores.Contains(100);
+            Assert.Equal("e => e.Scores.Contains(100)", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_ArrayNotContainsValue()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => !e.Scores.Contains(100);
+            Assert.Equal("e => (!(e.Scores.Contains(100)))", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_ArrayInValue()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => e.Scores.Intersect(new [] { 100 }).Any();
+            Assert.Equal("e => e.Scores.Intersect(new [] { 100 }).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_ArrayNotInValue()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => e.Scores.Except(new[] { 100 }).Any();
+            Assert.Equal("e => e.Scores.Except(new [] { 100 }).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_ArrayInValueOposite()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => new[] { 100 }.Intersect(e.Scores).Any();
+            Assert.Equal("e => new [] { 100 }.Intersect(e.Scores).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_ArrayNotInValueOposite()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => new[] { 100 }.Except(e.Scores).Any();
+            Assert.Equal("e => new [] { 100 }.Except(e.Scores).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_IntArrayInValueOposite()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => new[] { 100 }.Intersect(e.Scores).Any();
+            Assert.Equal("e => new [] { 100 }.Intersect(e.Scores).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_IntArrayNotInValueOposite()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => !new[] { 100 }.Intersect(e.Scores).Any();
+            Assert.Equal("e => (!(new [] { 100 }.Intersect(e.Scores).Any()))", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_DoubleArrayInValueOposite()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => new[] { 99.99 }.Intersect(e.Salaries).Any();
+            Assert.Equal("e => new [] { 99.99 }.Intersect(e.Salaries).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_FloatArrayInValueOposite()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => new[] { 5.5f }.Intersect(e.Heights).Any();
+            Assert.Equal("e => new [] { 5.5 }.Intersect(e.Heights).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_DecimalArrayInValueOposite()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => new[] { 1000.75m }.Intersect(e.Balances).Any();
+            Assert.Equal("e => new [] { 1000.75 }.Intersect(e.Balances).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_ShortArrayInValueOposite()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => new [] { (short)3 }.Intersect(e.Levels).Any();
+            Assert.Equal("e => new [] { 3 }.Intersect(e.Levels).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_LongArrayInValueOposite()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => new [] { 1000000L }.Intersect(e.Populations).Any();
+            Assert.Equal("e => new [] { 1000000 }.Intersect(e.Populations).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_StringArrayInValueOposite()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => new[] { "Alice", "Bob" }.Intersect(e.Names).Any();
+            Assert.Equal("e => (new [] { \"Alice\", \"Bob\" }).Intersect(e.Names).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_GuidArrayInValueOposite()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => new[] { Guid.Parse("12345678-1234-1234-1234-123456789abc") }.Intersect(e.Ids).Any();
+            Assert.Equal("e => (new [] { Guid.Parse(\"12345678-1234-1234-1234-123456789abc\") }).Intersect(e.Ids).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_DateTimeArrayInValueOposite()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => new[] { DateTime.Parse("2023-01-01T00:00:00.000Z") }.Intersect(e.CreatedDates).Any();
+            Assert.Equal("e => (new [] { DateTime.Parse(\"2023-01-01T00:00:00.000Z\") }).Intersect(e.CreatedDates).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_DateTimeOffsetArrayInValueOposite()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => new[] { DateTimeOffset.Parse("2023-01-01T10:30:00.000+00:00") }.Intersect(e.UpdatedDates).Any();
+            Assert.Equal("e => (new [] { DateTimeOffset.Parse(\"2023-01-01T10:30:00.000+00:00\") }).Intersect(e.UpdatedDates).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_DateTimeWithRoundtripKind()
+        {
+            Expression<Func<TestEntity, bool>> expr = e =>
+                DateTime.Parse("2023-01-01T00:00:00.000Z", null, DateTimeStyles.RoundtripKind) > e.CreatedAt;
+
+            Assert.Equal(
+                "e => (DateTime.Parse(\"2023-01-01T00:00:00.000Z\", null, (System.Globalization.DateTimeStyles)128) > e.CreatedAt)",
+                _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_TimeOnlyArrayInValueOposite()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => new[] { TimeOnly.Parse("12:00:00") }.Intersect(e.StartTimes).Any();
+            Assert.Equal("e => (new [] { TimeOnly.Parse(\"12:00:00\") }).Intersect(e.StartTimes).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_DateOnlyArrayInValueOposite()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => new[] { DateOnly.Parse("2000-01-01") }.Intersect(e.BirthDates).Any();
+            Assert.Equal("e => (new [] { DateOnly.Parse(\"2000-01-01\") }).Intersect(e.BirthDates).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_EnumArrayInValueOposite()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => new[] { Status.Active, Status.Inactive }.Intersect(e.Statuses).Any();
+            Assert.Equal("e => (new [] { (Radzen.Blazor.Tests.Status)0, (Radzen.Blazor.Tests.Status)1 }).Intersect(e.Statuses).Any()", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_ListContainsValue()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => e.Tags.Contains("VIP");
+            Assert.Equal("e => e.Tags.Contains(\"VIP\")", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_ListNotContainsValue()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => !e.Tags.Contains("VIP");
+            Assert.Equal("e => (!(e.Tags.Contains(\"VIP\")))", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_ListAnyCheck()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => e.Children.Any(c => c.Age > 18);
+            Assert.Equal("e => e.Children.Any(c => (c.Age > 18))", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_ListNotAnyCheck()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => !e.Children.Any(c => c.Age > 18);
+            Assert.Equal("e => (!(e.Children.Any(c => (c.Age > 18))))", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_EntitySubPropertyCheck()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => e.Address.City == "New York";
+            Assert.Equal("e => (e.Address.City == \"New York\")", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_ComplexExpressionWithProperties()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => e.Age > 18 && e.Tags.Contains("Member") || e.Address.City == "London";
+            Assert.Equal("e => (((e.Age > 18) && e.Tags.Contains(\"Member\")) || (e.Address.City == \"London\"))", _serializer.Serialize(expr));
+        }
+
+        [Fact]
+        public void Serializes_NotContains()
+        {
+            Expression<Func<TestEntity, bool>> expr = e => !e.Tags.Contains("Member");
+            Assert.Equal("e => (!(e.Tags.Contains(\"Member\")))", _serializer.Serialize(expr));
+        }
+    }
+}

Radzen.Blazor.Tests/FieldsetTests.cs

@@ -184,13 +184,13 @@ namespace Radzen.Blazor.Tests
 
             Assert.Contains("SummaryContent", component.Markup);
             Assert.Equal(
-                "",
-                component.Find(".rz-fieldset-content-summary").ParentElement.Attributes.First(attr => attr.Name == "style").Value
+                "false",
+                component.Find(".rz-fieldset-content-summary").ParentElement.ParentElement.Attributes.First(attr => attr.Name == "aria-hidden").Value
             );
         }
 
         [Fact]
-        public void Fieldset_DontRenders_SummaryWhenOpen()
+        public void Fieldset_DoesNotRender_SummaryWhenOpen()
         {
             using var ctx = new TestContext();
             var component = ctx.RenderComponent<RadzenFieldset>();
@@ -210,8 +210,8 @@ namespace Radzen.Blazor.Tests
 
             Assert.Contains("SummaryContent", component.Markup);
             Assert.Equal(
-                "display: none",
-                component.Find(".rz-fieldset-content-summary").ParentElement.Attributes.First(attr => attr.Name == "style").Value
+                "true",
+                component.Find(".rz-fieldset-content-summary").ParentElement.ParentElement.Attributes.First(attr => attr.Name == "aria-hidden").Value
             );
         }
     }

Radzen.Blazor.Tests/FileInputTests.cs

@@ -0,0 +1,182 @@
+using Bunit;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class FileInputTests
+    {
+        [Fact]
+        public void FileInput_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenFileInput<string>>();
+
+            Assert.Contains(@"rz-fileupload", component.Markup);
+        }
+
+        [Fact]
+        public void FileInput_Renders_ChooseButton()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenFileInput<string>>();
+
+            Assert.Contains("rz-fileupload-choose", component.Markup);
+            Assert.Contains("rz-button", component.Markup);
+        }
+
+        [Fact]
+        public void FileInput_Renders_ChooseText()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenFileInput<string>>(parameters =>
+            {
+                parameters.Add(p => p.ChooseText, "Select File");
+            });
+
+            Assert.Contains("Select File", component.Markup);
+        }
+
+        [Fact]
+        public void FileInput_Renders_DefaultChooseText()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenFileInput<string>>();
+
+            Assert.Contains("Choose", component.Markup);
+        }
+
+        [Fact]
+        public void FileInput_Renders_Disabled()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenFileInput<string>>(parameters =>
+            {
+                parameters.Add(p => p.Disabled, true);
+            });
+
+            Assert.Contains("rz-state-disabled", component.Markup);
+            Assert.Contains("disabled", component.Markup);
+        }
+
+        [Fact]
+        public void FileInput_Renders_Accept()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenFileInput<string>>(parameters =>
+            {
+                parameters.Add(p => p.Accept, "application/pdf");
+            });
+
+            Assert.Contains("accept=\"application/pdf\"", component.Markup);
+        }
+
+        [Fact]
+        public void FileInput_Renders_DefaultAccept()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenFileInput<string>>();
+
+            Assert.Contains("accept=\"image/*\"", component.Markup);
+        }
+
+        [Fact]
+        public void FileInput_Renders_FileInputElement()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenFileInput<string>>();
+
+            Assert.Contains("type=\"file\"", component.Markup);
+        }
+
+        [Fact]
+        public void FileInput_Renders_Title_WhenSet()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenFileInput<string>>(parameters =>
+            {
+                parameters.Add(p => p.Title, "MyDocument.pdf");
+                parameters.Add(p => p.Value, "data:application/pdf;base64,test");
+            });
+
+            Assert.Contains("MyDocument.pdf", component.Markup);
+        }
+
+        [Fact]
+        public void FileInput_Renders_FileName_WhenTitleNotSet()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenFileInput<string>>(parameters =>
+            {
+                parameters.Add(p => p.FileName, "document.pdf");
+                parameters.Add(p => p.Value, "data:application/pdf;base64,test");
+            });
+
+            Assert.Contains("document.pdf", component.Markup);
+        }
+
+        [Fact]
+        public void FileInput_Renders_DeleteButton_WhenValueSet()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenFileInput<string>>(parameters =>
+            {
+                parameters.Add(p => p.Value, "data:text/plain;base64,test");
+            });
+
+            Assert.Contains("rz-icon-trash", component.Markup);
+        }
+
+        [Fact]
+        public void FileInput_Renders_CustomDeleteText()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenFileInput<string>>(parameters =>
+            {
+                parameters.Add(p => p.DeleteText, "Remove File");
+                parameters.Add(p => p.Value, "data:text/plain;base64,test");
+            });
+
+            Assert.Contains("title=\"Remove File\"", component.Markup);
+        }
+
+        [Fact]
+        public void FileInput_Renders_ImagePreview_ForImageFile()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenFileInput<string>>(parameters =>
+            {
+                parameters.Add(p => p.Value, "data:image/png;base64,test");
+            });
+
+            Assert.Contains("<img", component.Markup);
+        }
+
+        [Fact]
+        public void FileInput_Renders_ImageAlternateText()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenFileInput<string>>(parameters =>
+            {
+                parameters.Add(p => p.ImageAlternateText, "User Photo");
+                parameters.Add(p => p.Value, "data:image/png;base64,test");
+            });
+
+            Assert.Contains("alt=\"User Photo\"", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/FormFieldTests.cs

@@ -0,0 +1,163 @@
+using Bunit;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class FormFieldTests
+    {
+        [Fact]
+        public void FormField_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenFormField>();
+
+            Assert.Contains(@"rz-form-field", component.Markup);
+        }
+
+        [Fact]
+        public void FormField_Renders_Text()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenFormField>(parameters =>
+            {
+                parameters.Add(p => p.Text, "Email Address");
+            });
+
+            Assert.Contains("Email Address", component.Markup);
+            Assert.Contains("rz-form-field-label", component.Markup);
+        }
+
+        [Fact]
+        public void FormField_Renders_Variant_Outlined()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenFormField>(parameters =>
+            {
+                parameters.Add(p => p.Variant, Variant.Outlined);
+            });
+
+            Assert.Contains("rz-variant-outlined", component.Markup);
+        }
+
+        [Fact]
+        public void FormField_Renders_Variant_Filled()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenFormField>(parameters =>
+            {
+                parameters.Add(p => p.Variant, Variant.Filled);
+            });
+
+            Assert.Contains("rz-variant-filled", component.Markup);
+        }
+
+        [Fact]
+        public void FormField_Renders_Variant_Flat()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenFormField>(parameters =>
+            {
+                parameters.Add(p => p.Variant, Variant.Flat);
+            });
+
+            Assert.Contains("rz-variant-flat", component.Markup);
+        }
+
+        [Fact]
+        public void FormField_Renders_Variant_Text()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenFormField>(parameters =>
+            {
+                parameters.Add(p => p.Variant, Variant.Text);
+            });
+
+            Assert.Contains("rz-variant-text", component.Markup);
+        }
+
+        [Fact]
+        public void FormField_Renders_AllowFloatingLabel_True()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenFormField>(parameters =>
+            {
+                parameters.Add(p => p.AllowFloatingLabel, true);
+            });
+
+            Assert.Contains("rz-floating-label", component.Markup);
+        }
+
+        [Fact]
+        public void FormField_Renders_AllowFloatingLabel_False()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenFormField>(parameters =>
+            {
+                parameters.Add(p => p.AllowFloatingLabel, false);
+            });
+
+            Assert.DoesNotContain("rz-floating-label", component.Markup);
+        }
+
+        [Fact]
+        public void FormField_Renders_Component_Attribute()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenFormField>(parameters =>
+            {
+                parameters.Add(p => p.Component, "email-input");
+            });
+
+            Assert.Contains("for=\"email-input\"", component.Markup);
+        }
+
+        [Fact]
+        public void FormField_Renders_Helper()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenFormField>(parameters =>
+            {
+                parameters.Add(p => p.Helper, builder => builder.AddContent(0, "Enter your email address"));
+            });
+
+            Assert.Contains("rz-form-field-helper", component.Markup);
+            Assert.Contains("Enter your email address", component.Markup);
+        }
+
+        [Fact]
+        public void FormField_Renders_Start()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenFormField>(parameters =>
+            {
+                parameters.Add(p => p.Start, builder => builder.AddMarkupContent(0, "<span>Start</span>"));
+            });
+
+            Assert.Contains("rz-form-field-start", component.Markup);
+            Assert.Contains("Start", component.Markup);
+        }
+
+        [Fact]
+        public void FormField_Renders_End()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenFormField>(parameters =>
+            {
+                parameters.Add(p => p.End, builder => builder.AddMarkupContent(0, "<span>End</span>"));
+            });
+
+            Assert.Contains("rz-form-field-end", component.Markup);
+            Assert.Contains("End", component.Markup);
+        }
+
+        [Fact]
+        public void FormField_Renders_FormFieldContent()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenFormField>();
+
+            Assert.Contains("rz-form-field-content", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/HeadingTests.cs

@@ -0,0 +1,103 @@
+using Bunit;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class HeadingTests
+    {
+        [Fact]
+        public void Heading_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenHeading>();
+
+            Assert.Contains(@"rz-heading", component.Markup);
+        }
+
+        [Fact]
+        public void Heading_Renders_TextParameter()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenHeading>();
+
+            var text = "Test Heading";
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Text, text));
+
+            Assert.Contains(text, component.Markup);
+        }
+
+        [Fact]
+        public void Heading_Renders_H1_ByDefault()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenHeading>();
+
+            var text = "Heading Text";
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Text, text));
+
+            Assert.Contains("<h1", component.Markup);
+        }
+
+        [Fact]
+        public void Heading_Renders_H2_Size()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenHeading>();
+
+            var text = "Heading 2";
+            component.SetParametersAndRender(parameters =>
+            {
+                parameters.Add(p => p.Text, text);
+                parameters.Add(p => p.Size, "H2");
+            });
+
+            Assert.Contains("<h2", component.Markup);
+            Assert.Contains(text, component.Markup);
+        }
+
+        [Fact]
+        public void Heading_Renders_H3_Size()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenHeading>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Size, "H3"));
+
+            Assert.Contains("<h3", component.Markup);
+        }
+
+        [Fact]
+        public void Heading_Renders_H4_Size()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenHeading>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Size, "H4"));
+
+            Assert.Contains("<h4", component.Markup);
+        }
+
+        [Fact]
+        public void Heading_Renders_H5_Size()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenHeading>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Size, "H5"));
+
+            Assert.Contains("<h5", component.Markup);
+        }
+
+        [Fact]
+        public void Heading_Renders_H6_Size()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenHeading>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Size, "H6"));
+
+            Assert.Contains("<h6", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/HtmlEditorTests.cs

@@ -0,0 +1,104 @@
+using Bunit;
+using Microsoft.Extensions.DependencyInjection;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class HtmlEditorTests
+    {
+        [Fact]
+        public void HtmlEditor_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.Services.AddScoped<DialogService>();
+            var component = ctx.RenderComponent<RadzenHtmlEditor>();
+
+            Assert.Contains(@"rz-html-editor", component.Markup);
+        }
+
+        [Fact]
+        public void HtmlEditor_Renders_ShowToolbar_True()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.Services.AddScoped<DialogService>();
+            var component = ctx.RenderComponent<RadzenHtmlEditor>(parameters =>
+            {
+                parameters.Add(p => p.ShowToolbar, true);
+            });
+
+            Assert.Contains("rz-html-editor-toolbar", component.Markup);
+        }
+
+        [Fact]
+        public void HtmlEditor_Renders_ShowToolbar_False()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.Services.AddScoped<DialogService>();
+            var component = ctx.RenderComponent<RadzenHtmlEditor>(parameters =>
+            {
+                parameters.Add(p => p.ShowToolbar, false);
+            });
+
+            Assert.DoesNotContain("rz-html-editor-toolbar", component.Markup);
+        }
+
+        [Fact]
+        public void HtmlEditor_Renders_Mode_Design()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.Services.AddScoped<DialogService>();
+            var component = ctx.RenderComponent<RadzenHtmlEditor>(parameters =>
+            {
+                parameters.Add(p => p.Mode, HtmlEditorMode.Design);
+            });
+
+            // Design mode shows the content editable div
+            Assert.Contains("contenteditable", component.Markup);
+        }
+
+        [Fact]
+        public void HtmlEditor_Renders_Mode_Source()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.Services.AddScoped<DialogService>();
+            var component = ctx.RenderComponent<RadzenHtmlEditor>(parameters =>
+            {
+                parameters.Add(p => p.Mode, HtmlEditorMode.Source);
+            });
+
+            // Source mode shows the textarea for HTML editing
+            Assert.Contains("rz-html-editor-source", component.Markup);
+        }
+
+        [Fact]
+        public void HtmlEditor_Renders_Disabled_Attribute()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.Services.AddScoped<DialogService>();
+            var component = ctx.RenderComponent<RadzenHtmlEditor>(parameters =>
+            {
+                parameters.Add(p => p.Disabled, true);
+            });
+
+            Assert.Contains("disabled", component.Markup);
+        }
+
+        [Fact]
+        public void HtmlEditor_Renders_ContentArea()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.Services.AddScoped<DialogService>();
+            var component = ctx.RenderComponent<RadzenHtmlEditor>();
+
+            Assert.Contains("rz-html-editor-content", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/ListBoxTests.cs

@@ -0,0 +1,197 @@
+using Bunit;
+using Xunit;
+using System.Collections.Generic;
+
+namespace Radzen.Blazor.Tests
+{
+    public class ListBoxTests
+    {
+        class Item
+        {
+            public int Id { get; set; }
+            public string Name { get; set; }
+        }
+
+        [Fact]
+        public void ListBox_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenListBox<int>>();
+
+            Assert.Contains(@"rz-listbox", component.Markup);
+        }
+
+        [Fact]
+        public void ListBox_Renders_WithData_SimpleList()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<string> { "Apple", "Banana", "Cherry" };
+            
+            var component = ctx.RenderComponent<RadzenListBox<string>>(parameters =>
+            {
+                parameters.Add(p => p.Data, data);
+            });
+
+            Assert.Contains("Apple", component.Markup);
+            Assert.Contains("Banana", component.Markup);
+            Assert.Contains("Cherry", component.Markup);
+        }
+
+        [Fact]
+        public void ListBox_Renders_WithData_CustomTextValueProperties()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<Item>
+            {
+                new Item { Id = 1, Name = "First Item" },
+                new Item { Id = 2, Name = "Second Item" }
+            };
+            
+            var component = ctx.RenderComponent<RadzenListBox<int>>(parameters =>
+            {
+                parameters.Add(p => p.Data, data);
+                parameters.Add(p => p.TextProperty, "Name");
+                parameters.Add(p => p.ValueProperty, "Id");
+            });
+
+            Assert.Contains("First Item", component.Markup);
+            Assert.Contains("Second Item", component.Markup);
+        }
+
+        [Fact]
+        public void ListBox_Renders_AllowFiltering()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenListBox<int>>(parameters =>
+            {
+                parameters.Add(p => p.AllowFiltering, true);
+                parameters.Add(p => p.Data, new List<string> { "Item1", "Item2" });
+            });
+
+            Assert.Contains("rz-listbox-filter", component.Markup);
+            Assert.Contains("rz-listbox-header", component.Markup);
+        }
+
+        [Fact]
+        public void ListBox_Renders_Disabled_Attribute()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenListBox<int>>(parameters =>
+            {
+                parameters.Add(p => p.Disabled, true);
+            });
+
+            Assert.Contains("disabled", component.Markup);
+        }
+
+        [Fact]
+        public void ListBox_Renders_Multiple_WithSelectAll()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenListBox<IEnumerable<int>>>(parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.SelectAllText, "Select All Items");
+                parameters.Add(p => p.Data, new List<string> { "Item1", "Item2" });
+            });
+
+            Assert.Contains("Select All Items", component.Markup);
+            Assert.Contains("rz-chkbox", component.Markup);
+        }
+
+        [Fact]
+        public void ListBox_Renders_FilterPlaceholder()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenListBox<int>>(parameters =>
+            {
+                parameters.Add(p => p.Placeholder, "Select an item");
+                parameters.Add(p => p.AllowFiltering, true);
+                parameters.Add(p => p.Data, new List<string> { "Item1", "Item2" });
+            });
+
+            Assert.Contains("Select an item", component.Markup);
+        }
+
+        [Fact]
+        public void ListBox_Renders_Multiple_WithCheckboxes()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<string> { "Item1", "Item2" };
+
+            var component = ctx.RenderComponent<RadzenListBox<IEnumerable<string>>>(parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.Data, data);
+            });
+
+            // Multiple selection shows checkboxes in header
+            Assert.Contains("rz-listbox-header-w-checkbox", component.Markup);
+        }
+
+        [Fact]
+        public void ListBox_Renders_ReadOnly()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenListBox<int>>(parameters =>
+            {
+                parameters.Add(p => p.ReadOnly, true);
+            });
+
+            Assert.Contains("readonly", component.Markup);
+        }
+
+        [Fact]
+        public void ListBox_Renders_TabIndex()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenListBox<int>>();
+
+            Assert.Contains("tabindex=", component.Markup);
+        }
+
+        [Fact]
+        public void ListBox_Renders_ListWrapper()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<string> { "Item1" };
+
+            var component = ctx.RenderComponent<RadzenListBox<string>>(parameters =>
+            {
+                parameters.Add(p => p.Data, data);
+            });
+
+            Assert.Contains("rz-listbox-list-wrapper", component.Markup);
+            Assert.Contains("rz-listbox-list", component.Markup);
+        }
+
+        [Fact]
+        public void ListBox_Renders_SearchAriaLabel()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenListBox<int>>(parameters =>
+            {
+                parameters.Add(p => p.AllowFiltering, true);
+                parameters.Add(p => p.SearchAriaLabel, "Search items");
+                parameters.Add(p => p.Data, new List<string> { "Item1" });
+            });
+
+            Assert.Contains("aria-label=\"Search items\"", component.Markup);
+        }
+    }
+}
+
+
+

Radzen.Blazor.Tests/Markdown/EmphasisTests.cs

@@ -11,6 +11,17 @@ public class EmphasisTests
     }
 
     [Theory]
+    [InlineData(@"**foo** bar
+baz",@"<document>
+    <paragraph>
+        <strong>
+            <text>foo</text>
+        </strong>
+        <text> bar</text>
+        <softbreak />
+        <text>baz</text>
+    </paragraph>
+</document>")]
     [InlineData("*foo bar*",
 @"<document>
     <paragraph>

Radzen.Blazor.Tests/Markdown/HtmlInlineTests.cs

@@ -141,4 +141,28 @@ foo <!---> foo -->
     {
         Assert.Equal(expected, ToXml(markdown));
     }
+
+    [Theory]
+    [InlineData("***foo bar***", @"<document>
+    <paragraph>
+        <emph>
+            <strong>
+                <text>foo bar</text>
+            </strong>
+        </emph>
+    </paragraph>
+</document>")]
+    [InlineData("___foo bar___", @"<document>
+    <paragraph>
+        <emph>
+            <strong>
+                <text>foo bar</text>
+            </strong>
+        </emph>
+    </paragraph>
+</document>")]
+    public void Parse_BoldAndItalic_ShouldNotThrowException(string markdown, string expected)
+    {
+        Assert.Equal(expected, ToXml(markdown));
+    }
 }

Radzen.Blazor.Tests/Markdown/LinkTests.cs

@@ -354,6 +354,15 @@ bar)", @"<document>
         </link>
     </paragraph>
 </document>")]
+    [InlineData(@"[![alt](img)](url)", @"<document>
+    <paragraph>
+        <link destination=""url"" title="""">
+            <image destination=""img"" title="""">
+                <text>alt</text>
+            </image>
+        </link>
+    </paragraph>
+</document>")]
 
     public void Parse_LinkTextIsInlineContent(string markdown, string expected)
     {

Radzen.Blazor.Tests/Markdown/TableTests.cs

@@ -135,6 +135,28 @@ bar | baz", @"<document>
             <cell />
         </row>
     </table>
+</document>")]
+[InlineData(@"| abc | def |
+| --- | --- |
+  c:\\foo", @"<document>
+    <table>
+        <header>
+            <cell>
+                <text>abc</text>
+            </cell>
+            <cell>
+                <text>def</text>
+            </cell>
+        </header>
+        <row>
+            <cell>
+                <text>c:</text>
+                <text>\</text>
+                <text>foo</text>
+            </cell>
+            <cell />
+        </row>
+    </table>
 </document>")]
     public void Parse_Table(string markdown, string expected)
     {

Radzen.Blazor.Tests/MediaQueryTests.cs

@@ -0,0 +1,65 @@
+using Bunit;
+using Microsoft.AspNetCore.Components;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class MediaQueryTests
+    {
+        [Fact]
+        public void MediaQuery_Renders()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            var component = ctx.RenderComponent<RadzenMediaQuery>(parameters =>
+            {
+                parameters.Add(p => p.Query, "(max-width: 768px)");
+            });
+
+            Assert.NotNull(component.Instance);
+        }
+
+        [Fact]
+        public void MediaQuery_HasQueryParameter()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            var query = "(max-width: 1024px)";
+            var component = ctx.RenderComponent<RadzenMediaQuery>(parameters =>
+            {
+                parameters.Add(p => p.Query, query);
+            });
+
+            Assert.Equal(query, component.Instance.Query);
+        }
+
+        [Fact]
+        public void MediaQuery_InvokesChangeCallback()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            bool changeInvoked = false;
+            bool matchResult = false;
+
+            var component = ctx.RenderComponent<RadzenMediaQuery>(parameters =>
+            {
+                parameters.Add(p => p.Query, "(max-width: 768px)");
+                parameters.Add(p => p.Change, EventCallback.Factory.Create<bool>(this, (matches) =>
+                {
+                    changeInvoked = true;
+                    matchResult = matches;
+                }));
+            });
+
+            // Invoke the JSInvokable method directly
+            component.Instance.OnChange(true);
+
+            Assert.True(changeInvoked);
+            Assert.True(matchResult);
+        }
+    }
+}
+

Radzen.Blazor.Tests/MenuTests.cs

@@ -0,0 +1,58 @@
+using Bunit;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class MenuTests
+    {
+        [Fact]
+        public void Menu_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenMenu>();
+
+            Assert.Contains(@"rz-menu", component.Markup);
+        }
+
+        [Fact]
+        public void Menu_Renders_Responsive_True()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenMenu>(parameters =>
+            {
+                parameters.Add(p => p.Responsive, true);
+            });
+
+            Assert.Contains("rz-menu-closed", component.Markup);
+            Assert.Contains("rz-menu-toggle", component.Markup);
+        }
+
+        [Fact]
+        public void Menu_Renders_Responsive_False()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenMenu>(parameters =>
+            {
+                parameters.Add(p => p.Responsive, false);
+            });
+
+            Assert.DoesNotContain("rz-menu-toggle", component.Markup);
+            Assert.DoesNotContain("rz-menu-closed", component.Markup);
+        }
+
+
+        [Fact]
+        public void Menu_Renders_CustomToggleAriaLabel()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenMenu>(parameters =>
+            {
+                parameters.Add(p => p.Responsive, true);
+                parameters.Add(p => p.ToggleAriaLabel, "Open navigation");
+            });
+
+            Assert.Contains("Open navigation", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/NumericRangeValidatorTests.cs

@@ -16,7 +16,7 @@ namespace Radzen.Blazor.Tests
 
             public string Name { get; set; }
 
-            public FieldIdentifier FieldIdentifier => throw new System.NotImplementedException();
+            public FieldIdentifier FieldIdentifier { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
 
             public object GetValue()
             {

Radzen.Blazor.Tests/PanelMenuTests.cs

@@ -1,8 +1,9 @@
 using Bunit;
-using Bunit.TestDoubles;
 using Microsoft.AspNetCore.Components;
 using Microsoft.AspNetCore.Components.Routing;
 using Microsoft.Extensions.DependencyInjection.Extensions;
+using System.Collections.Generic;
+using System.Linq;
 using Xunit;
 
 namespace Radzen.Blazor.Tests
@@ -22,6 +23,9 @@ namespace Radzen.Blazor.Tests
         }
 
         private static string CreatePanelMenu(string currentAbsoluteUrl, NavLinkMatch match, params string[] urls)
+            => CreatePanelMenu(currentAbsoluteUrl, match, new Dictionary<string, bool>(urls.Select(url => new KeyValuePair<string, bool>(url, false))));
+
+        private static string CreatePanelMenu(string currentAbsoluteUrl, NavLinkMatch match, Dictionary<string, bool> urls)
         {
             using var ctx = new TestContext();
 
@@ -30,12 +34,13 @@ namespace Radzen.Blazor.Tests
 
             var component = ctx.RenderComponent<RadzenPanelMenu>();
 
-            component.SetParametersAndRender(parameters => parameters.Add(p => p.Match, match).AddChildContent(builder => 
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Match, match).AddChildContent(builder =>
             {
                 foreach (var url in urls)
                 {
                     builder.OpenComponent<RadzenPanelMenuItem>(0);
-                    builder.AddAttribute(1, nameof(RadzenPanelMenuItem.Path), url);
+                    builder.AddAttribute(1, nameof(RadzenPanelMenuItem.Path), url.Key);
+                    builder.AddAttribute(2, nameof(RadzenPanelMenuItem.Disabled), url.Value);
                     builder.CloseComponent();
                 }
             }));
@@ -55,6 +60,19 @@ namespace Radzen.Blazor.Tests
             Assert.Equal(firstIndex, lastIndex);
         }
 
+        [Fact]
+        public void RadzenPanelMenu_CanDisableMenuItem()
+        {
+            var urls = new Dictionary<string, bool>
+            {
+                {"/datagrid", false},
+                {"/disabled-url", true}
+            };
+            var component = CreatePanelMenu("http://www.example.com/", NavLinkMatch.All, urls);
+
+            Assert.Contains("rz-state-disabled", component);
+        }
+
         [Fact]
         public void RadzenPanelMenu_MatchesQueryStringParameters()
         {

Radzen.Blazor.Tests/PanelTests.cs

@@ -198,14 +198,10 @@ namespace Radzen.Blazor.Tests
             });
 
             Assert.Contains("SummaryContent", component.Markup);
-            Assert.Equal(
-                "display: block",
-                component.Find(".rz-panel-content-summary").ParentElement.Attributes.First(attr => attr.Name == "style").Value
-            );
         }
 
         [Fact]
-        public void Panel_DontRenders_SummaryWhenOpen()
+        public void Panel_DoesNotRender_SummaryWhenOpen()
         {
             using var ctx = new TestContext();
             var component = ctx.RenderComponent<RadzenPanel>();
@@ -225,8 +221,8 @@ namespace Radzen.Blazor.Tests
 
             Assert.Contains("SummaryContent", component.Markup);
             Assert.Equal(
-                "display: none",
-                component.Find(".rz-panel-content-summary").ParentElement.Attributes.First(attr => attr.Name == "style").Value
+                "true",
+                component.Find(".rz-panel-content-summary").ParentElement.ParentElement.Attributes.First(attr => attr.Name == "aria-hidden").Value
             );
         }
     }

Radzen.Blazor.Tests/PasswordTests.cs

@@ -171,24 +171,49 @@ namespace Radzen.Blazor.Tests
 
             Assert.Contains(@$"autofocus", component.Markup);
         }
-        
+
         [Fact]
         public void Password_Raises_ChangedEvent()
         {
             using var ctx = new TestContext();
-
-            var component = ctx.RenderComponent<RadzenPassword>();
-
-            var raised = false;
+            var hasRaised = false;
             var value = "Test";
             object newValue = null;
 
-            component.SetParametersAndRender(parameters => parameters.Add(p => p.Change, args => { raised = true; newValue = args; }));
+            var component = ctx.RenderComponent<RadzenPassword>(parameters =>
+            {
+                parameters.Add(p => p.Change, args => { hasRaised = true; newValue = args; });
+                parameters.Add(p => p.Immediate, false);
+            });
 
-            component.Find("input").Change(value);
+            var inputElement = component.Find("input");
+            inputElement.Change(value);
 
-            Assert.True(raised);
-            Assert.True(object.Equals(value, newValue));
+            Assert.DoesNotContain("oninput", inputElement.ToMarkup());
+            Assert.True(hasRaised);
+            Assert.Equal(value, newValue);
+        }
+
+        [Fact]
+        public void Password_Raises_InputEvent()
+        {
+            using var ctx = new TestContext();
+            var hasRaised = false;
+            var value = "Test";
+            object newValue = null;
+
+            var component = ctx.RenderComponent<RadzenPassword>(parameters =>
+            {
+                parameters.Add(p => p.Change, args => { hasRaised = true; newValue = args; });
+                parameters.Add(p => p.Immediate, true);
+            });
+
+            var inputElement = component.Find("input");
+            inputElement.Input(value);
+
+            Assert.DoesNotContain("onchange", inputElement.ToMarkup());
+            Assert.True(hasRaised);
+            Assert.Equal(value, newValue);
         }
 
         [Fact]

Radzen.Blazor.Tests/PickListTests.cs

@@ -0,0 +1,220 @@
+using Bunit;
+using Xunit;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Radzen.Blazor.Tests
+{
+    public class PickListTests
+    {
+        class Item
+        {
+            public int Id { get; set; }
+            public string Name { get; set; }
+        }
+
+        [Fact]
+        public void PickList_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenPickList<Item>>();
+
+            Assert.Contains(@"rz-picklist", component.Markup);
+        }
+
+        [Fact]
+        public void PickList_Renders_SourceAndTargetLists()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenPickList<Item>>();
+
+            Assert.Contains("rz-picklist-source-wrapper", component.Markup);
+            Assert.Contains("rz-picklist-target-wrapper", component.Markup);
+        }
+
+        [Fact]
+        public void PickList_Renders_TransferButtons()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenPickList<Item>>();
+
+            Assert.Contains("rz-picklist-buttons", component.Markup);
+        }
+
+        [Fact]
+        public void PickList_Renders_Orientation_Horizontal()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenPickList<Item>>(parameters =>
+            {
+                parameters.Add(p => p.Orientation, Orientation.Horizontal);
+            });
+
+            Assert.Contains("rz-flex-row", component.Markup);
+        }
+
+        [Fact]
+        public void PickList_Renders_Orientation_Vertical()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenPickList<Item>>(parameters =>
+            {
+                parameters.Add(p => p.Orientation, Orientation.Vertical);
+            });
+
+            Assert.Contains("rz-flex-column", component.Markup);
+        }
+
+        [Fact]
+        public void PickList_Renders_AllowFiltering()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<Item>
+            {
+                new Item { Id = 1, Name = "Item 1" }
+            };
+
+            var component = ctx.RenderComponent<RadzenPickList<Item>>(parameters =>
+            {
+                parameters.Add(p => p.AllowFiltering, true);
+                parameters.Add(p => p.Source, data);
+                parameters.Add(p => p.TextProperty, "Name");
+            });
+
+            Assert.Contains("rz-listbox-filter", component.Markup);
+        }
+
+        [Fact]
+        public void PickList_Renders_SourceData()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<Item>
+            {
+                new Item { Id = 1, Name = "Source Item 1" },
+                new Item { Id = 2, Name = "Source Item 2" }
+            };
+
+            var component = ctx.RenderComponent<RadzenPickList<Item>>(parameters =>
+            {
+                parameters.Add(p => p.Source, data);
+                parameters.Add(p => p.TextProperty, "Name");
+            });
+
+            Assert.Contains("Source Item 1", component.Markup);
+            Assert.Contains("Source Item 2", component.Markup);
+        }
+
+        [Fact]
+        public void PickList_Renders_ShowHeader()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenPickList<Item>>(parameters =>
+            {
+                parameters.Add(p => p.ShowHeader, true);
+                parameters.Add(p => p.SourceHeader, builder => builder.AddContent(0, "Available Items"));
+                parameters.Add(p => p.TargetHeader, builder => builder.AddContent(0, "Selected Items"));
+            });
+
+            Assert.Contains("Available Items", component.Markup);
+            Assert.Contains("Selected Items", component.Markup);
+        }
+
+        [Fact]
+        public void PickList_Renders_AllowMoveAll_Buttons()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<Item> { new Item { Id = 1, Name = "Item" } };
+
+            var component = ctx.RenderComponent<RadzenPickList<Item>>(parameters =>
+            {
+                parameters.Add(p => p.AllowMoveAll, true);
+                parameters.Add(p => p.Source, data);
+            });
+
+            // Should have 4 buttons when AllowMoveAll is true
+            var buttonCount = System.Text.RegularExpressions.Regex.Matches(component.Markup, "rz-button").Count;
+            Assert.True(buttonCount >= 4);
+        }
+
+        [Fact]
+        public void PickList_Renders_Disabled()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenPickList<Item>>(parameters =>
+            {
+                parameters.Add(p => p.Disabled, true);
+            });
+
+            Assert.Contains("disabled", component.Markup);
+        }
+
+        [Fact]
+        public void PickList_GetSelectedSources_Respects_ValueProperty_Single()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            var data = new List<Item>
+            {
+                new Item { Id = 1, Name = "A" },
+                new Item { Id = 2, Name = "B" }
+            };
+
+            var component = ctx.RenderComponent<RadzenPickList<Item>>(parameters =>
+            {
+                parameters.Add(p => p.Source, data);
+                parameters.Add(p => p.TextProperty, "Name");
+                parameters.Add(p => p.ValueProperty, "Id");
+                parameters.Add(p => p.Multiple, false);
+            });
+
+            // Simulate ListBox selection when ValueProperty is set: selectedSourceItems becomes the value (Id)
+            var field = typeof(RadzenPickList<Item>).GetField("selectedSourceItems", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
+            field.SetValue(component.Instance, 2);
+
+            var selected = component.Instance.GetSelectedSources();
+            Assert.Single(selected);
+            Assert.Equal(2, selected.First().Id);
+        }
+
+        [Fact]
+        public void PickList_GetSelectedSources_Respects_ValueProperty_Multiple()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            var data = new List<Item>
+            {
+                new Item { Id = 1, Name = "A" },
+                new Item { Id = 2, Name = "B" },
+                new Item { Id = 3, Name = "C" }
+            };
+
+            var component = ctx.RenderComponent<RadzenPickList<Item>>(parameters =>
+            {
+                parameters.Add(p => p.Source, data);
+                parameters.Add(p => p.TextProperty, "Name");
+                parameters.Add(p => p.ValueProperty, "Id");
+                parameters.Add(p => p.Multiple, true);
+            });
+
+            // Simulate ListBox selection when ValueProperty is set: selectedSourceItems becomes IEnumerable of values (Ids)
+            var field = typeof(RadzenPickList<Item>).GetField("selectedSourceItems", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
+            field.SetValue(component.Instance, new[] { 1, 3 });
+
+            var selected = component.Instance.GetSelectedSources().Select(i => i.Id).OrderBy(i => i).ToArray();
+            Assert.Equal(new[] { 1, 3 }, selected);
+        }
+    }
+}
+

Radzen.Blazor.Tests/PivotDataGridTests.cs

@@ -0,0 +1,644 @@
+using Bunit;
+using Microsoft.AspNetCore.Components;
+using Radzen;
+using Radzen.Blazor;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class PivotDataGridTests
+    {
+        private static readonly List<SalesData> SampleData = new()
+        {
+            new SalesData { Region = "North", Category = "Electronics", Product = "Laptop", Amount = 1000, Year = 2023 },
+            new SalesData { Region = "North", Category = "Electronics", Product = "Laptop", Amount = 1500, Year = 2024 },
+            new SalesData { Region = "South", Category = "Home", Product = "Vacuum", Amount = 500, Year = 2023 }
+        };
+
+        public class SalesData
+        {
+            public string Region { get; set; }
+            public string Category { get; set; }
+            public string Product { get; set; }
+            public double Amount { get; set; }
+            public int Year { get; set; }
+        }
+
+        [Fact]
+        public void PivotDataGrid_Renders_CssClasses()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx);
+
+            component.WaitForAssertion(() =>
+            {
+                Assert.Contains("rz-pivot-data-grid", component.Markup);
+                Assert.Contains("rz-pivot-table", component.Markup);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_Renders_RowAndColumnHeaders()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx);
+
+            component.WaitForAssertion(() =>
+            {
+                var table = component.Find(".rz-pivot-content .rz-pivot-table");
+                var headers = table.GetElementsByClassName("rz-pivot-header-text").Select(h => h.TextContent.Trim()).ToList();
+                var aggregateHeaders = table.GetElementsByClassName("rz-pivot-aggregate-header").Select(h => h.TextContent.Trim()).ToList();
+
+                Assert.Contains("Region", headers);
+                Assert.Contains("2023", headers);
+                Assert.Contains("Sales", aggregateHeaders);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_AllowSorting_RendersSortableClass()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.AllowSorting, true);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                var sortableHeaders = component.FindAll(".rz-pivot-header-content.rz-sortable");
+                Assert.NotEmpty(sortableHeaders);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_AllowFiltering_RendersFilterIcon()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.AllowFiltering, true);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                var filterIcons = component.FindAll(".rz-grid-filter-icon");
+                Assert.NotEmpty(filterIcons);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_Renders_AggregateValues()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx);
+
+            component.WaitForAssertion(() =>
+            {
+                Assert.Contains("1000", component.Markup);
+                Assert.Contains("1500", component.Markup);
+                Assert.Contains("500", component.Markup);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_DisallowFiltering_HidesFilterIcon()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.AllowFiltering, false);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                var filterIcons = component.FindAll(".rz-grid-filter-icon");
+                Assert.Empty(filterIcons);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_DisallowSorting_HidesSortableClass()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.AllowSorting, false);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                var sortableHeaders = component.FindAll(".rz-pivot-header-content.rz-sortable");
+                Assert.Empty(sortableHeaders);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_ShowColumnsTotals_RendersFooter()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.ShowColumnsTotals, true);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                var footer = component.FindAll(".rz-pivot-footer");
+                Assert.NotEmpty(footer);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_HideColumnsTotals_NoFooter()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.ShowColumnsTotals, false);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                var footer = component.FindAll(".rz-pivot-footer");
+                Assert.Empty(footer);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_Renders_DefaultEmptyText()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenPivotDataGrid<SalesData>>(parameters =>
+            {
+                parameters.Add(p => p.Data, new List<SalesData>());
+                parameters.Add(p => p.AllowFieldsPicking, false);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                Assert.Contains("No records to display.", component.Markup);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_Renders_CustomEmptyText()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenPivotDataGrid<SalesData>>(parameters =>
+            {
+                parameters.Add(p => p.Data, new List<SalesData>());
+                parameters.Add(p => p.EmptyText, "No data available");
+                parameters.Add(p => p.AllowFieldsPicking, false);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                Assert.Contains("No data available", component.Markup);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_AllowPaging_RendersPager()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.AllowPaging, true);
+                parameters.Add(p => p.PageSize, 2);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                Assert.Contains("rz-pager", component.Markup);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_DisallowPaging_HidesPager()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.AllowPaging, false);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                Assert.DoesNotContain("rz-pager", component.Markup);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_PagerPosition_Top()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.AllowPaging, true);
+                parameters.Add(p => p.PagerPosition, PagerPosition.Top);
+                parameters.Add(p => p.PageSize, 2);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                Assert.Contains("rz-pager", component.Markup);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_PagerPosition_TopAndBottom()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.AllowPaging, true);
+                parameters.Add(p => p.PagerPosition, PagerPosition.TopAndBottom);
+                parameters.Add(p => p.PageSize, 2);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                var pagers = component.FindAll(".rz-pager");
+                Assert.True(pagers.Count >= 1); // Should have at least one pager
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_Density_Compact()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.AllowPaging, true);
+                parameters.Add(p => p.PageSize, 1); // Force pager to show with small page size
+                parameters.Add(p => p.AllowFieldsPicking, false);
+                parameters.Add(p => p.Density, Density.Compact);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                Assert.Contains("rz-density-compact", component.Markup);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_AllowAlternatingRows_True()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.AllowAlternatingRows, true);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                Assert.Contains("rz-grid-table-striped", component.Markup);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_AllowAlternatingRows_False()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.AllowAlternatingRows, false);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                Assert.DoesNotContain("rz-grid-table-striped", component.Markup);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_AllowFieldsPicking_ShowsPanel()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.AllowFieldsPicking, true);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                Assert.Contains("rz-panel", component.Markup);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_AllowFieldsPicking_False_HidesPanel()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.AllowFieldsPicking, false);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                Assert.DoesNotContain("rz-panel", component.Markup);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_Renders_AllowDrillDown()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.AllowDrillDown, true);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                // Should render pivot content
+                Assert.Contains("rz-pivot-content", component.Markup);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_Renders_RowValues()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx);
+
+            component.WaitForAssertion(() =>
+            {
+                var cells = component.FindAll(".rz-pivot-row-header");
+                var cellTexts = cells.Select(c => c.TextContent.Trim()).ToList();
+                
+                Assert.Contains("North", cellTexts);
+                Assert.Contains("South", cellTexts);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_Renders_MultipleRows()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenPivotDataGrid<SalesData>>(parameters =>
+            {
+                parameters.Add(p => p.Data, SampleData);
+
+                parameters.Add<RenderFragment>(p => p.Rows, builder =>
+                {
+                    builder.OpenComponent<RadzenPivotRow<SalesData>>(0);
+                    builder.AddAttribute(1, nameof(RadzenPivotRow<SalesData>.Property), nameof(SalesData.Region));
+                    builder.AddAttribute(2, nameof(RadzenPivotRow<SalesData>.Title), "Region");
+                    builder.CloseComponent();
+
+                    builder.OpenComponent<RadzenPivotRow<SalesData>>(2);
+                    builder.AddAttribute(3, nameof(RadzenPivotRow<SalesData>.Property), nameof(SalesData.Category));
+                    builder.AddAttribute(4, nameof(RadzenPivotRow<SalesData>.Title), "Category");
+                    builder.CloseComponent();
+                });
+
+                parameters.Add<RenderFragment>(p => p.Columns, builder =>
+                {
+                    builder.OpenComponent<RadzenPivotColumn<SalesData>>(0);
+                    builder.AddAttribute(1, nameof(RadzenPivotColumn<SalesData>.Property), nameof(SalesData.Year));
+                    builder.AddAttribute(2, nameof(RadzenPivotColumn<SalesData>.Title), "Year");
+                    builder.CloseComponent();
+                });
+
+                parameters.Add<RenderFragment>(p => p.Aggregates, builder =>
+                {
+                    builder.OpenComponent<RadzenPivotAggregate<SalesData>>(0);
+                    builder.AddAttribute(1, nameof(RadzenPivotAggregate<SalesData>.Property), nameof(SalesData.Amount));
+                    builder.AddAttribute(2, nameof(RadzenPivotAggregate<SalesData>.Title), "Sales");
+                    builder.AddAttribute(3, nameof(RadzenPivotAggregate<SalesData>.Aggregate), AggregateFunction.Sum);
+                    builder.CloseComponent();
+                });
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                var headers = component.FindAll(".rz-pivot-header-text").Select(h => h.TextContent.Trim()).ToList();
+                Assert.Contains("Region", headers);
+                Assert.Contains("Category", headers);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_Renders_MultipleAggregates()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenPivotDataGrid<SalesData>>(parameters =>
+            {
+                parameters.Add(p => p.Data, SampleData);
+
+                parameters.Add<RenderFragment>(p => p.Rows, builder =>
+                {
+                    builder.OpenComponent<RadzenPivotRow<SalesData>>(0);
+                    builder.AddAttribute(1, nameof(RadzenPivotRow<SalesData>.Property), nameof(SalesData.Region));
+                    builder.AddAttribute(2, nameof(RadzenPivotRow<SalesData>.Title), "Region");
+                    builder.CloseComponent();
+                });
+
+                parameters.Add<RenderFragment>(p => p.Columns, builder =>
+                {
+                    builder.OpenComponent<RadzenPivotColumn<SalesData>>(0);
+                    builder.AddAttribute(1, nameof(RadzenPivotColumn<SalesData>.Property), nameof(SalesData.Year));
+                    builder.AddAttribute(2, nameof(RadzenPivotColumn<SalesData>.Title), "Year");
+                    builder.CloseComponent();
+                });
+
+                parameters.Add<RenderFragment>(p => p.Aggregates, builder =>
+                {
+                    builder.OpenComponent<RadzenPivotAggregate<SalesData>>(0);
+                    builder.AddAttribute(1, nameof(RadzenPivotAggregate<SalesData>.Property), nameof(SalesData.Amount));
+                    builder.AddAttribute(2, nameof(RadzenPivotAggregate<SalesData>.Title), "Total Sales");
+                    builder.AddAttribute(3, nameof(RadzenPivotAggregate<SalesData>.Aggregate), AggregateFunction.Sum);
+                    builder.CloseComponent();
+
+                    builder.OpenComponent<RadzenPivotAggregate<SalesData>>(4);
+                    builder.AddAttribute(5, nameof(RadzenPivotAggregate<SalesData>.Property), nameof(SalesData.Amount));
+                    builder.AddAttribute(6, nameof(RadzenPivotAggregate<SalesData>.Title), "Count Sales");
+                    builder.AddAttribute(7, nameof(RadzenPivotAggregate<SalesData>.Aggregate), AggregateFunction.Count);
+                    builder.CloseComponent();
+                });
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                var aggregateHeaders = component.FindAll(".rz-pivot-aggregate-header").Select(h => h.TextContent.Trim()).ToList();
+                Assert.Contains("Total Sales", aggregateHeaders);
+                Assert.Contains("Count Sales", aggregateHeaders);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_Renders_AlternatingRowClasses()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = RenderPivotDataGrid(ctx, parameters =>
+            {
+                parameters.Add(p => p.AllowAlternatingRows, true);
+            });
+
+            component.WaitForAssertion(() =>
+            {
+                Assert.Contains("rz-pivot-row-even", component.Markup);
+                Assert.Contains("rz-pivot-row-odd", component.Markup);
+            });
+        }
+
+        [Fact]
+        public void PivotDataGrid_PageSize_DefaultsTo10()
+        {
+            var grid = new RadzenPivotDataGrid<SalesData>();
+            Assert.Equal(10, grid.PageSize);
+        }
+
+        [Fact]
+        public void PivotDataGrid_AllowSorting_DefaultsToTrue()
+        {
+            var grid = new RadzenPivotDataGrid<SalesData>();
+            Assert.True(grid.AllowSorting);
+        }
+
+        [Fact]
+        public void PivotDataGrid_AllowFiltering_DefaultsToTrue()
+        {
+            var grid = new RadzenPivotDataGrid<SalesData>();
+            Assert.True(grid.AllowFiltering);
+        }
+
+        [Fact]
+        public void PivotDataGrid_AllowAlternatingRows_DefaultsToTrue()
+        {
+            var grid = new RadzenPivotDataGrid<SalesData>();
+            Assert.True(grid.AllowAlternatingRows);
+        }
+
+        [Fact]
+        public void PivotDataGrid_AllowDrillDown_DefaultsToTrue()
+        {
+            var grid = new RadzenPivotDataGrid<SalesData>();
+            Assert.True(grid.AllowDrillDown);
+        }
+
+        [Fact]
+        public void PivotDataGrid_AllowFieldsPicking_DefaultsToTrue()
+        {
+            var grid = new RadzenPivotDataGrid<SalesData>();
+            Assert.True(grid.AllowFieldsPicking);
+        }
+
+        private static IRenderedComponent<RadzenPivotDataGrid<SalesData>> RenderPivotDataGrid(TestContext ctx, Action<ComponentParameterCollectionBuilder<RadzenPivotDataGrid<SalesData>>> configure = null)
+        {
+            return ctx.RenderComponent<RadzenPivotDataGrid<SalesData>>(parameters =>
+            {
+                parameters.Add(p => p.Data, SampleData);
+
+                parameters.Add<RenderFragment>(p => p.Rows, builder =>
+                {
+                    builder.OpenComponent<RadzenPivotRow<SalesData>>(0);
+                    builder.AddAttribute(1, nameof(RadzenPivotRow<SalesData>.Property), nameof(SalesData.Region));
+                    builder.AddAttribute(2, nameof(RadzenPivotRow<SalesData>.Title), "Region");
+                    builder.CloseComponent();
+                });
+
+                parameters.Add<RenderFragment>(p => p.Columns, builder =>
+                {
+                    builder.OpenComponent<RadzenPivotColumn<SalesData>>(0);
+                    builder.AddAttribute(1, nameof(RadzenPivotColumn<SalesData>.Property), nameof(SalesData.Year));
+                    builder.AddAttribute(2, nameof(RadzenPivotColumn<SalesData>.Title), "Year");
+                    builder.CloseComponent();
+                });
+
+                parameters.Add<RenderFragment>(p => p.Aggregates, builder =>
+                {
+                    builder.OpenComponent<RadzenPivotAggregate<SalesData>>(0);
+                    builder.AddAttribute(1, nameof(RadzenPivotAggregate<SalesData>.Property), nameof(SalesData.Amount));
+                    builder.AddAttribute(2, nameof(RadzenPivotAggregate<SalesData>.Title), "Sales");
+                    builder.AddAttribute(3, nameof(RadzenPivotAggregate<SalesData>.Aggregate), AggregateFunction.Sum);
+                    builder.CloseComponent();
+                });
+
+                configure?.Invoke(parameters);
+            });
+        }
+    }
+}
+

Radzen.Blazor.Tests/ProfileMenuItemTests.cs

@@ -0,0 +1,120 @@
+using Bunit;
+using Microsoft.AspNetCore.Components;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class ProfileMenuItemTests
+    {
+        [Fact]
+        public void ProfileMenuItem_Renders_TextParameter()
+        {
+            using var ctx = new TestContext();
+
+            var component = ctx.RenderComponent<RadzenProfileMenu>(parameters =>
+            {
+                parameters.Add(p => p.ChildContent, builder =>
+                {
+                    builder.OpenComponent<RadzenProfileMenuItem>(0);
+                    builder.AddAttribute(1, "Text", "Profile");
+                    builder.CloseComponent();
+                });
+            });
+
+            Assert.Contains("Profile", component.Markup);
+        }
+
+        [Fact]
+        public void ProfileMenuItem_Renders_IconParameter()
+        {
+            using var ctx = new TestContext();
+
+            var component = ctx.RenderComponent<RadzenProfileMenu>(parameters =>
+            {
+                parameters.Add(p => p.ChildContent, builder =>
+                {
+                    builder.OpenComponent<RadzenProfileMenuItem>(0);
+                    builder.AddAttribute(1, "Icon", "account_circle");
+                    builder.AddAttribute(2, "Text", "Profile");
+                    builder.CloseComponent();
+                });
+            });
+
+            Assert.Contains("account_circle", component.Markup);
+        }
+
+        [Fact]
+        public void ProfileMenuItem_Template_OverridesText()
+        {
+            using var ctx = new TestContext();
+
+            var component = ctx.RenderComponent<RadzenProfileMenu>(parameters =>
+            {
+                parameters.Add(p => p.ChildContent, builder =>
+                {
+                    builder.OpenComponent<RadzenProfileMenuItem>(0);
+                    builder.AddAttribute(1, "Text", "This should not appear");
+                    builder.AddAttribute(2, "Template", (RenderFragment)((templateBuilder) =>
+                    {
+                        templateBuilder.OpenElement(0, "span");
+                        templateBuilder.AddAttribute(1, "class", "template-content");
+                        templateBuilder.AddContent(2, "Template Content");
+                        templateBuilder.CloseElement();
+                    }));
+                    builder.CloseComponent();
+                });
+            });
+
+            // Template should be rendered
+            Assert.Contains("template-content", component.Markup);
+            // Text should not be rendered in navigation-item-text span when Template is present
+            Assert.DoesNotContain("<span class=\"rz-navigation-item-text\">This should not appear</span>", component.Markup);
+        }
+
+        [Fact]
+        public void ProfileMenuItem_Renders_TemplateWithSwitch()
+        {
+            using var ctx = new TestContext();
+
+            var component = ctx.RenderComponent<RadzenProfileMenu>(parameters =>
+            {
+                parameters.Add(p => p.ChildContent, builder =>
+                {
+                    builder.OpenComponent<RadzenProfileMenuItem>(0);
+                    builder.AddAttribute(1, "Icon", "settings");
+                    builder.AddAttribute(2, "Template", (RenderFragment)((templateBuilder) =>
+                    {
+                        templateBuilder.OpenComponent<RadzenSwitch>(0);
+                        templateBuilder.CloseComponent();
+                    }));
+                    builder.CloseComponent();
+                });
+            });
+
+            // Icon should still be rendered
+            Assert.Contains("settings", component.Markup);
+            // Switch should be rendered from template
+            Assert.Contains("rz-switch", component.Markup);
+        }
+
+        [Fact]
+        public void ProfileMenuItem_Renders_PathParameter()
+        {
+            using var ctx = new TestContext();
+
+            var component = ctx.RenderComponent<RadzenProfileMenu>(parameters =>
+            {
+                parameters.Add(p => p.ChildContent, builder =>
+                {
+                    builder.OpenComponent<RadzenProfileMenuItem>(0);
+                    builder.AddAttribute(1, "Text", "Settings");
+                    builder.AddAttribute(2, "Path", "/settings");
+                    builder.CloseComponent();
+                });
+            });
+
+            Assert.Contains("href=\"/settings\"", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/ProgressBarTests.cs

@@ -142,5 +142,45 @@ namespace Radzen.Blazor.Tests
             component.SetParametersAndRender(parameters => parameters.Add(p => p.Mode, ProgressBarMode.Indeterminate));
             Assert.Contains(@$"rz-progressbar-info", component.Markup);
         }
+
+        [Fact]
+        public void ProgressBar_Renders_ShowValue_True()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenProgressBar>(parameters =>
+            {
+                parameters.Add(p => p.ShowValue, true);
+                parameters.Add(p => p.Value, 50);
+            });
+
+            Assert.Contains("rz-progressbar-label", component.Markup);
+            Assert.Contains("50%", component.Markup);
+        }
+
+        [Fact]
+        public void ProgressBar_Renders_ShowValue_False()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenProgressBar>(parameters =>
+            {
+                parameters.Add(p => p.ShowValue, false);
+                parameters.Add(p => p.Value, 50);
+            });
+
+            Assert.DoesNotContain("rz-progressbar-label", component.Markup);
+        }
+
+        [Fact]
+        public void ProgressBar_Renders_Template()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenProgressBar>(parameters =>
+            {
+                parameters.Add(p => p.Value, 75);
+                parameters.Add(p => p.Template, builder => builder.AddContent(0, "Custom: 75%"));
+            });
+
+            Assert.Contains("Custom: 75%", component.Markup);
+        }
     }
 }

Radzen.Blazor.Tests/PropertyAccessTests.cs

@@ -113,5 +113,43 @@ namespace Radzen.Blazor.Tests
         {
             public List<string> Values { get; set; }
         }
+
+        [Fact]
+        public void GetProperty_Should_Resolve_DescriptionProperty()
+        {
+            var descriptionProperty = PropertyAccess.GetProperty(typeof(ISimpleInterface), nameof(ISimpleInterface.Description));
+
+            Assert.NotNull(descriptionProperty);
+        }
+
+        [Fact]
+        public void GetProperty_Should_Resolve_NameProperty()
+        {
+            var nameProperty = PropertyAccess.GetProperty(typeof(ISimpleInterface), nameof(ISimpleInterface.Name));
+
+            Assert.NotNull(nameProperty);
+        }
+
+        [Fact]
+        public void GetProperty_Should_Resolve_IdProperty()
+        {
+            var idProperty = PropertyAccess.GetProperty(typeof(ISimpleInterface), nameof(ISimpleBaseInterface.Id));
+            Assert.NotNull(idProperty);
+        }
+
+        interface ISimpleInterface : ISimpleNestedInterface
+        {
+            string Description { get; set; }
+        }
+
+        interface ISimpleNestedInterface : ISimpleBaseInterface
+        {
+            string Name { get; set; }
+        }
+
+        interface ISimpleBaseInterface
+        {
+            int Id { get; set; }
+        }
     }
 }

Radzen.Blazor.Tests/RadioButtonListTests.cs

@@ -0,0 +1,62 @@
+using Bunit;
+using System.Collections.Generic;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class RadioButtonListTests
+    {
+        [Fact]
+        public void RadioButtonList_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenRadioButtonList<int>>();
+
+            Assert.Contains(@"rz-radio-button-list", component.Markup);
+        }
+
+        [Fact]
+        public void RadioButtonList_Renders_Orientation()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenRadioButtonList<int>>(parameters =>
+            {
+                parameters.Add(p => p.Items, builder =>
+                {
+                    builder.OpenComponent<RadzenRadioButtonListItem<int>>(0);
+                    builder.AddAttribute(1, "Text", "Option 1");
+                    builder.AddAttribute(2, "Value", 1);
+                    builder.CloseComponent();
+                });
+            });
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Orientation, Orientation.Horizontal));
+            // Orientation is applied via RadzenStack which uses flex-direction
+            Assert.Contains("rz-flex-row", component.Markup);
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Orientation, Orientation.Vertical));
+            Assert.Contains("rz-flex-column", component.Markup);
+        }
+
+        [Fact]
+        public void RadioButtonList_Renders_Disabled()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenRadioButtonList<int>>(parameters =>
+            {
+                parameters.Add(p => p.Disabled, true);
+                parameters.Add(p => p.Items, builder =>
+                {
+                    builder.OpenComponent<RadzenRadioButtonListItem<int>>(0);
+                    builder.AddAttribute(1, "Text", "Option 1");
+                    builder.AddAttribute(2, "Value", 1);
+                    builder.CloseComponent();
+                });
+            });
+
+            // Disabled class is on the radio button items
+            Assert.Contains("rz-state-disabled", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/Radzen.Blazor.Tests.csproj

@@ -1,13 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net9</TargetFramework>
-
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>disable</Nullable>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
     <PackageReference Include="bunit.web" Version="1.36.0" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">

Radzen.Blazor.Tests/RatingTests.cs

@@ -0,0 +1,82 @@
+using Bunit;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class RatingTests
+    {
+        [Fact]
+        public void Rating_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenRating>();
+
+            Assert.Contains(@"rz-rating", component.Markup);
+        }
+
+        [Fact]
+        public void Rating_Renders_Stars()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenRating>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Stars, 5));
+
+            // Should render 5 star icons (rzi-star or rzi-star-o) + 1 clear button icon = 6 total
+            var starCount = System.Text.RegularExpressions.Regex.Matches(component.Markup, "rz-rating-icon").Count;
+            Assert.Equal(6, starCount); // 5 stars + 1 clear button
+        }
+
+        [Fact]
+        public void Rating_Renders_CustomStarCount()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenRating>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Stars, 10));
+
+            var starCount = System.Text.RegularExpressions.Regex.Matches(component.Markup, "rz-rating-icon").Count;
+            Assert.Equal(11, starCount); // 10 stars + 1 clear button
+        }
+
+        [Fact]
+        public void Rating_Renders_Value()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenRating>();
+
+            component.SetParametersAndRender(parameters =>
+            {
+                parameters.Add(p => p.Value, 3);
+                parameters.Add(p => p.Stars, 5);
+            });
+
+            // Should have 3 filled stars (rzi-star) and 2 outline stars (rzi-star-o)
+            var filledStars = System.Text.RegularExpressions.Regex.Matches(component.Markup, "rzi-star\"").Count;
+            Assert.Equal(3, filledStars);
+        }
+
+        [Fact]
+        public void Rating_Renders_ReadOnly()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenRating>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.ReadOnly, true));
+
+            Assert.Contains("rz-state-readonly", component.Markup);
+        }
+
+        [Fact]
+        public void Rating_Renders_Disabled()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenRating>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Disabled, true));
+
+            Assert.Contains("rz-state-disabled", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/RowTests.cs

@@ -0,0 +1,63 @@
+using Bunit;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class RowTests
+    {
+        [Fact]
+        public void Row_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenRow>();
+
+            Assert.Contains(@"rz-row", component.Markup);
+        }
+
+        [Fact]
+        public void Row_Renders_ChildContent()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenRow>(parameters =>
+            {
+                parameters.AddChildContent("<div>Row Content</div>");
+            });
+
+            Assert.Contains("Row Content", component.Markup);
+        }
+
+        [Fact]
+        public void Row_Renders_Gap()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenRow>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Gap, "2rem"));
+
+            Assert.Contains("--rz-gap:2rem", component.Markup);
+        }
+
+        [Fact]
+        public void Row_Renders_RowGap()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenRow>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.RowGap, "1.5rem"));
+
+            Assert.Contains("--rz-row-gap:1.5rem", component.Markup);
+        }
+
+        [Fact]
+        public void Row_Renders_ColumnGap()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenRow>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Gap, "1rem"));
+
+            Assert.Contains("--rz-gap:1rem", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/SchedulerYearRangeTests.cs

@@ -0,0 +1,63 @@
+using Bunit;
+using Microsoft.JSInterop;
+using Microsoft.Extensions.DependencyInjection;
+using Radzen.Blazor;
+using Radzen.Blazor.Rendering;
+using Radzen;
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class SchedulerYearRangeTests
+    {
+        class Appointment
+        {
+            public DateTime Start { get; set; }
+            public DateTime End { get; set; }
+            public string Text { get; set; } = "";
+        }
+
+        [Fact]
+        public void YearView_StartMonthJanuary_IncludesLastDaysOfYear_WhenYearStartsOnFirstDayOfWeek()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.Services.AddScoped<DialogService>();
+            ctx.JSInterop.Setup<Rect>("Radzen.createScheduler", _ => true)
+                .SetResult(new Rect { Left = 0, Top = 0, Width = 200, Height = 200 });
+
+            // Make the first day of week Monday and use a year where Jan 1 is Monday (2024-01-01).
+            var culture = (CultureInfo)CultureInfo.InvariantCulture.Clone();
+            culture.DateTimeFormat.FirstDayOfWeek = DayOfWeek.Monday;
+
+            var appointments = new List<Appointment>
+            {
+                new() { Start = new DateTime(2024, 12, 31), End = new DateTime(2025, 1, 1), Text = "Year end" }
+            };
+
+            var cut = ctx.RenderComponent<RadzenScheduler<Appointment>>(p =>
+            {
+                p.Add(x => x.Culture, culture);
+                p.Add(x => x.Date, new DateTime(2024, 6, 1));
+                p.Add(x => x.Data, appointments);
+                p.Add(x => x.StartProperty, nameof(Appointment.Start));
+                p.Add(x => x.EndProperty, nameof(Appointment.End));
+                p.Add(x => x.TextProperty, nameof(Appointment.Text));
+                p.AddChildContent<RadzenYearView>(v => v.Add(x => x.StartMonth, Radzen.Month.January));
+            });
+
+            var view = Assert.IsType<RadzenYearView>(cut.Instance.SelectedView);
+
+            // View should start on 2023-12-25 (one extra week above since 2024-01-01 is Monday).
+            Assert.Equal(new DateTime(2023, 12, 25), view.StartDate.Date);
+
+            // View end must include 2024-12-31 (it should extend to end-of-week containing the real year end).
+            Assert.True(view.EndDate.Date >= new DateTime(2024, 12, 31), $"EndDate was {view.EndDate:yyyy-MM-dd}");
+        }
+    }
+}
+
+

Radzen.Blazor.Tests/SecurityCodeTests.cs

@@ -0,0 +1,45 @@
+using Bunit;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class SecurityCodeTests
+    {
+        [Fact]
+        public void SecurityCode_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenSecurityCode>();
+
+            Assert.Contains(@"rz-security-code", component.Markup);
+        }
+
+        [Fact]
+        public void SecurityCode_Renders_Count()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenSecurityCode>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Count, 6));
+
+            // Should render 6 input boxes + 1 hidden input for form submission = 7 total
+            var inputCount = System.Text.RegularExpressions.Regex.Matches(component.Markup, "<input").Count;
+            Assert.Equal(7, inputCount);
+        }
+
+        [Fact]
+        public void SecurityCode_Renders_Disabled()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var component = ctx.RenderComponent<RadzenSecurityCode>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Disabled, true));
+
+            Assert.Contains("disabled", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/SelectBarTests.cs

@@ -0,0 +1,83 @@
+using Bunit;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class SelectBarTests
+    {
+        [Fact]
+        public void SelectBar_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenSelectBar<int>>();
+
+            Assert.Contains(@"rz-selectbar", component.Markup);
+        }
+
+        [Fact]
+        public void SelectBar_Renders_Orientation()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenSelectBar<int>>(parameters =>
+            {
+                parameters.Add(p => p.Items, builder =>
+                {
+                    builder.OpenComponent<RadzenSelectBarItem>(0);
+                    builder.AddAttribute(1, "Text", "Option 1");
+                    builder.AddAttribute(2, "Value", 1);
+                    builder.CloseComponent();
+                });
+            });
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Orientation, Orientation.Horizontal));
+            Assert.Contains("rz-selectbar-horizontal", component.Markup);
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Orientation, Orientation.Vertical));
+            Assert.Contains("rz-selectbar-vertical", component.Markup);
+        }
+
+        [Fact]
+        public void SelectBar_Renders_Multiple()
+        {
+            using var ctx = new TestContext();
+            // When Multiple is true, TValue should be IEnumerable<T>
+            var component = ctx.RenderComponent<RadzenSelectBar<System.Collections.Generic.IEnumerable<int>>>(parameters =>
+            {
+                parameters.Add(p => p.Multiple, true);
+                parameters.Add(p => p.Items, builder =>
+                {
+                    builder.OpenComponent<RadzenSelectBarItem>(0);
+                    builder.AddAttribute(1, "Text", "Option 1");
+                    builder.AddAttribute(2, "Value", 1);
+                    builder.CloseComponent();
+                });
+            });
+
+            Assert.NotNull(component.Instance);
+            Assert.True(component.Instance.Multiple);
+        }
+
+        [Fact]
+        public void SelectBar_Renders_Size()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenSelectBar<int>>(parameters =>
+            {
+                parameters.Add(p => p.Items, builder =>
+                {
+                    builder.OpenComponent<RadzenSelectBarItem>(0);
+                    builder.AddAttribute(1, "Text", "Option 1");
+                    builder.AddAttribute(2, "Value", 1);
+                    builder.CloseComponent();
+                });
+            });
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Size, ButtonSize.Small));
+            Assert.Contains("rz-button-sm", component.Markup);
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Size, ButtonSize.Large));
+            Assert.Contains("rz-button-lg", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/SidebarToggleTests.cs

@@ -0,0 +1,65 @@
+using Bunit;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class SidebarToggleTests
+    {
+        [Fact]
+        public void SidebarToggle_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenSidebarToggle>();
+
+            Assert.Contains(@"rz-sidebar-toggle", component.Markup);
+        }
+
+        [Fact]
+        public void SidebarToggle_Renders_DefaultIcon()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenSidebarToggle>();
+
+            Assert.Contains("menu", component.Markup);
+        }
+
+        [Fact]
+        public void SidebarToggle_Renders_CustomIcon()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenSidebarToggle>();
+
+            var icon = "close";
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Icon, icon));
+
+            Assert.Contains(icon, component.Markup);
+        }
+
+        [Fact]
+        public void SidebarToggle_Renders_AriaLabel()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenSidebarToggle>();
+
+            var ariaLabel = "Toggle Navigation";
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.ToggleAriaLabel, ariaLabel));
+
+            Assert.Contains($"aria-label=\"{ariaLabel}\"", component.Markup);
+        }
+
+        [Fact]
+        public void SidebarToggle_Raises_ClickEvent()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenSidebarToggle>();
+
+            var clicked = false;
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Click, args => { clicked = true; }));
+
+            component.Find("button").Click();
+
+            Assert.True(clicked);
+        }
+    }
+}
+

Radzen.Blazor.Tests/SkeletonTests.cs

@@ -0,0 +1,158 @@
+using Bunit;
+using Radzen.Blazor.Rendering;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class SkeletonTests
+    {
+        [Fact]
+        public void Skeleton_Renders_CssClass()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenSkeleton>();
+
+            Assert.Contains("rz-skeleton", component.Markup);
+            Assert.Contains("rz-skeleton-text", component.Markup);
+        }
+
+        [Fact]
+        public void Skeleton_Renders_TypeParameter()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenSkeleton>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Variant, SkeletonVariant.Circular));
+
+            Assert.Contains("rz-skeleton", component.Markup);
+            Assert.Contains("rz-skeleton-circular", component.Markup);
+        }
+
+        [Theory]
+        [InlineData(SkeletonVariant.Text, "rz-skeleton-text")]
+        [InlineData(SkeletonVariant.Circular, "rz-skeleton-circular")]
+        [InlineData(SkeletonVariant.Rectangular, "rz-skeleton-rectangular")]
+        public void Skeleton_Renders_AllTypes(SkeletonVariant type, string expectedClass)
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenSkeleton>(parameters => parameters.Add(p => p.Variant, type));
+
+            Assert.Contains("rz-skeleton", component.Markup);
+            Assert.Contains(expectedClass, component.Markup);
+        }
+
+        [Fact]
+        public void Skeleton_Renders_AnimationParameter()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenSkeleton>();
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Animation, SkeletonAnimation.Wave));
+
+            Assert.Contains("rz-skeleton", component.Markup);
+            Assert.Contains("rz-skeleton-wave", component.Markup);
+        }
+
+        [Theory]
+        [InlineData(SkeletonAnimation.Wave, "rz-skeleton-wave")]
+        [InlineData(SkeletonAnimation.Pulse, "rz-skeleton-pulse")]
+        public void Skeleton_Renders_AllAnimations(SkeletonAnimation animation, string expectedClass)
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenSkeleton>(parameters => parameters.Add(p => p.Animation, animation));
+
+            Assert.Contains("rz-skeleton", component.Markup);
+            Assert.Contains(expectedClass, component.Markup);
+        }
+
+        [Fact]
+        public void Skeleton_Renders_StyleParameter()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenSkeleton>();
+
+            var style = "width: 200px; height: 20px;";
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Style, style));
+
+            Assert.Contains($"style=\"{style}\"", component.Markup);
+        }
+
+        [Fact]
+        public void Skeleton_Renders_VisibleParameter()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenSkeleton>();
+
+            // Should be visible by default
+            Assert.Contains("rz-skeleton", component.Markup);
+
+            component.SetParametersAndRender(parameters => parameters.Add(p => p.Visible, false));
+
+            // Should not render when not visible
+            Assert.DoesNotContain("rz-skeleton", component.Markup);
+        }
+
+        [Fact]
+        public void Skeleton_Renders_UnmatchedParameter()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenSkeleton>();
+
+            component.SetParametersAndRender(parameters => parameters.AddUnmatched("data-testid", "skeleton-test"));
+
+            Assert.Contains("data-testid=\"skeleton-test\"", component.Markup);
+        }
+
+        [Fact]
+        public void Skeleton_DefaultType_IsText()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenSkeleton>();
+
+            // Should render with text type by default
+            Assert.Contains("rz-skeleton-text", component.Markup);
+        }
+
+        [Fact]
+        public void Skeleton_DefaultAnimation_IsNone()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenSkeleton>();
+
+            // Should not render animation classes by default
+            Assert.DoesNotContain("rz-skeleton-wave", component.Markup);
+            Assert.DoesNotContain("rz-skeleton-pulse", component.Markup);
+        }
+    }
+} 

Radzen.Blazor.Tests/SliderTests.cs

@@ -89,5 +89,71 @@ namespace Radzen.Blazor.Tests
 
             Assert.Contains(@$"autofocus", component.Markup);
         }
+
+        [Fact]
+        public void Slider_Renders_Orientation_Vertical()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenSlider<int>>(parameters =>
+            {
+                parameters.Add(p => p.Orientation, Orientation.Vertical);
+            });
+
+            Assert.Contains("rz-slider-vertical", component.Markup);
+        }
+
+        [Fact]
+        public void Slider_Renders_Disabled()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenSlider<int>>(parameters =>
+            {
+                parameters.Add(p => p.Disabled, true);
+            });
+
+            Assert.Contains("rz-state-disabled", component.Markup);
+        }
+
+        [Fact]
+        public void Slider_Renders_SliderHandle()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenSlider<int>>();
+
+            Assert.Contains("rz-slider-handle", component.Markup);
+        }
+
+        [Fact]
+        public void Slider_Renders_SliderRange()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenSlider<int>>();
+
+            Assert.Contains("rz-slider-range", component.Markup);
+        }
+
+        [Fact]
+        public void Slider_Renders_TabIndex()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
+
+            var component = ctx.RenderComponent<RadzenSlider<int>>();
+
+            Assert.Contains("tabindex=\"0\"", component.Markup);
+        }
     }
 }

Radzen.Blazor.Tests/SplitterTests.cs

@@ -0,0 +1,42 @@
+using Bunit;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class SplitterTests
+    {
+        [Fact]
+        public void Splitter_Renders_WithClassName()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenSplitter>();
+
+            Assert.Contains(@"rz-splitter", component.Markup);
+        }
+
+        [Fact]
+        public void Splitter_Renders_Orientation_Horizontal()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenSplitter>(parameters =>
+            {
+                parameters.Add(p => p.Orientation, Orientation.Horizontal);
+            });
+
+            Assert.Contains("rz-splitter-horizontal", component.Markup);
+        }
+
+        [Fact]
+        public void Splitter_Renders_Orientation_Vertical()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenSplitter>(parameters =>
+            {
+                parameters.Add(p => p.Orientation, Orientation.Vertical);
+            });
+
+            Assert.Contains("rz-splitter-vertical", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor.Tests/Spreadsheet/AggregateFunctionTests.cs

@@ -0,0 +1,49 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class AggregateFunctionTests
+{
+    readonly Sheet sheet = new(15, 5);
+
+    void SeedWithErrors()
+    {
+        sheet.Cells["A1"].Formula = "=A2/0"; // #DIV/0!
+        sheet.Cells["A2"].Value = 82;
+        sheet.Cells["A3"].Value = 72;
+        sheet.Cells["A4"].Value = 65;
+        sheet.Cells["A5"].Value = 30;
+        sheet.Cells["A6"].Value = 95;
+        sheet.Cells["A7"].Formula = "=0/0"; // #DIV/0!
+        sheet.Cells["A8"].Value = 63;
+        sheet.Cells["A9"].Value = 31;
+        sheet.Cells["A10"].Value = 53;
+        sheet.Cells["A11"].Value = 96;
+    }
+
+    [Fact]
+    public void ShouldComputeMaxIgnoringErrors()
+    {
+        SeedWithErrors();
+        sheet.Cells["B1"].Formula = "=AGGREGATE(4,6,A1:A11)"; // MAX ignoring errors
+        Assert.Equal(96d, sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldComputeLargeIgnoringErrors()
+    {
+        SeedWithErrors();
+        sheet.Cells["B1"].Formula = "=AGGREGATE(14,6,A1:A11,3)"; // LARGE k=3 ignoring errors
+        Assert.Equal(82d, sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnValueErrorWhenKMissingForSmall()
+    {
+        SeedWithErrors();
+        sheet.Cells["B1"].Formula = "=AGGREGATE(15,6,A1:A11)"; // SMALL requires k
+        Assert.Equal(CellError.Value, sheet.Cells["B1"].Value);
+    }
+}
+
+

Radzen.Blazor.Tests/Spreadsheet/AndFunctionTests.cs

@@ -0,0 +1,160 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class AndFunctionTests
+{
+    readonly Sheet sheet = new(5, 5);
+
+    [Fact]
+    public void ShouldEvaluateAndFunctionWithAllTrueValues()
+    {
+        sheet.Cells["A1"].Value = true;
+        sheet.Cells["A2"].Value = true;
+        sheet.Cells["A3"].Formula = "=AND(A1,A2)";
+
+        Assert.Equal(true, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAndFunctionWithOneFalseValue()
+    {
+        sheet.Cells["A1"].Value = true;
+        sheet.Cells["A2"].Value = false;
+        sheet.Cells["A3"].Formula = "=AND(A1,A2)";
+
+        Assert.Equal(false, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAndFunctionWithAllFalseValues()
+    {
+        sheet.Cells["A1"].Value = false;
+        sheet.Cells["A2"].Value = false;
+        sheet.Cells["A3"].Formula = "=AND(A1,A2)";
+
+        Assert.Equal(false, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAndFunctionWithNumericValues()
+    {
+        sheet.Cells["A1"].Value = 5;
+        sheet.Cells["A2"].Value = 10;
+        sheet.Cells["A3"].Formula = "=AND(A1>1,A2<100)";
+
+        Assert.Equal(true, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAndFunctionWithZeroAsFalse()
+    {
+        sheet.Cells["A1"].Value = 0;
+        sheet.Cells["A2"].Value = 1;
+        sheet.Cells["A3"].Formula = "=AND(A1,A2)";
+
+        Assert.Equal(false, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAndFunctionWithNonZeroAsTrue()
+    {
+        sheet.Cells["A1"].Value = 5;
+        sheet.Cells["A2"].Value = 10;
+        sheet.Cells["A3"].Formula = "=AND(A1,A2)";
+
+        Assert.Equal(true, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAndFunctionWithStringValues()
+    {
+        sheet.Cells["A1"].Value = "test";
+        sheet.Cells["A2"].Value = "hello";
+        sheet.Cells["A3"].Formula = "=AND(A1,A2)";
+
+        Assert.Equal(CellError.Value, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAndFunctionWithEmptyStringAsFalse()
+    {
+        sheet.Cells["A2"].Value = "hello";
+        sheet.Cells["A3"].Formula = "=AND(A1,A2)";
+
+        Assert.Equal(CellError.Value, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAndFunctionWithMultipleArguments()
+    {
+        sheet.Cells["A1"].Value = true;
+        sheet.Cells["A2"].Value = true;
+        sheet.Cells["A3"].Value = true;
+        sheet.Cells["A4"].Formula = "=AND(A1,A2,A3)";
+
+        Assert.Equal(true, sheet.Cells["A4"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAndFunctionWithOneFalseInMultipleArguments()
+    {
+        sheet.Cells["A1"].Value = true;
+        sheet.Cells["A2"].Value = false;
+        sheet.Cells["A3"].Value = true;
+        sheet.Cells["A4"].Formula = "=AND(A1,A2,A3)";
+
+        Assert.Equal(false, sheet.Cells["A4"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnValueErrorForEmptyAndFunction()
+    {
+        sheet.Cells["A1"].Formula = "=AND()";
+
+        Assert.Equal(CellError.Value, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAndFunctionWithRangeExpression()
+    {
+        sheet.Cells["A1"].Value = true;
+        sheet.Cells["A2"].Value = true;
+        sheet.Cells["A3"].Formula = "=AND(A1:A2)";
+
+        Assert.Equal(true, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAndFunctionWithMixedTypes()
+    {
+        sheet.Cells["A1"].Value = 5;
+        sheet.Cells["A2"].Value = "3";
+        sheet.Cells["A3"].Value = true;
+        sheet.Cells["A4"].Formula = "=AND(A1,A2,A3)";
+
+        Assert.Equal(true, sheet.Cells["A4"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAndFunctionInIfStatement()
+    {
+        sheet.Cells["A1"].Value = 5;
+        sheet.Cells["A2"].Value = 10;
+        sheet.Cells["A3"].Formula = "=IF(AND(A1>1,A2<100),A1,\"Out of range\")";
+
+        Assert.Equal(5d, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAndFunctionInIfStatementWithFalseCondition()
+    {
+        sheet.Cells["A1"].Value = 5;
+        sheet.Cells["A2"].Value = 150;
+        sheet.Cells["A3"].Formula = "=IF(AND(A1>1,A2<100),A1,\"Out of range\")";
+
+        Assert.Equal("Out of range", sheet.Cells["A3"].Value);
+    }
+}
+
+

Radzen.Blazor.Tests/Spreadsheet/AutoFilterTests.cs

@@ -0,0 +1,105 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class AutoFilterTests
+{
+    private readonly Sheet sheet = new(10, 10);
+
+    [Fact]
+    public void Should_ToggleSheetAutoFilter()
+    {
+        // Initially no auto filter
+        Assert.Null(sheet.AutoFilter);
+
+        // Apply auto filter to range A1:C5
+        var range = RangeRef.Parse("A1:C5");
+        var command = new SheetAutoFilterCommand(sheet, range);
+        command.Execute();
+
+        // Auto filter should be applied
+        Assert.NotNull(sheet.AutoFilter);
+        Assert.Equal(range, sheet.AutoFilter.Range);
+
+        // Undo the command
+        command.Unexecute();
+
+        // Auto filter should be removed
+        Assert.Null(sheet.AutoFilter);
+    }
+
+    [Fact]
+    public void Should_ToggleDataTableFilterButton()
+    {
+        // Add a data table
+        var range = RangeRef.Parse("A1:C5");
+        sheet.AddTable(range);
+
+        var table = sheet.Tables[0];
+        
+        // Initially ShowFilterButton should be true
+        Assert.True(table.ShowFilterButton);
+
+        // Toggle filter button off
+        var command = new TableFilterCommand(sheet, 0);
+        command.Execute();
+
+        // ShowFilterButton should be false
+        Assert.False(table.ShowFilterButton);
+
+        // Undo the command
+        command.Unexecute();
+
+        // ShowFilterButton should be true again
+        Assert.True(table.ShowFilterButton);
+    }
+
+    [Fact]
+    public void Should_HandleMultipleDataTables()
+    {
+        // Add two data tables
+        sheet.AddTable(RangeRef.Parse("A1:C5"));
+        sheet.AddTable(RangeRef.Parse("E1:G5"));
+
+        var table1 = sheet.Tables[0];
+        var table2 = sheet.Tables[1];
+
+        // Initially both should have ShowFilterButton = true
+        Assert.True(table1.ShowFilterButton);
+        Assert.True(table2.ShowFilterButton);
+
+        // Toggle filter button for first data table
+        var command1 = new TableFilterCommand(sheet, 0);
+        command1.Execute();
+
+        // Only first data table should be affected
+        Assert.False(table1.ShowFilterButton);
+        Assert.True(table2.ShowFilterButton);
+
+        // Toggle filter button for second data table
+        var command2 = new TableFilterCommand(sheet, 1);
+        command2.Execute();
+
+        // Both should be affected
+        Assert.False(table1.ShowFilterButton);
+        Assert.False(table2.ShowFilterButton);
+
+        // Undo second command
+        command2.Unexecute();
+
+        // Only second data table should be restored
+        Assert.False(table1.ShowFilterButton);
+        Assert.True(table2.ShowFilterButton);
+    }
+
+    [Fact]
+    public void Should_HandleInvalidDataTableIndex()
+    {
+        // Try to toggle filter button for non-existent data table
+        var command = new TableFilterCommand(sheet, 0);
+        
+        // Should not throw exception
+        var result = command.Execute();
+        Assert.True(result);
+    }
+} 

Radzen.Blazor.Tests/Spreadsheet/AverageFunctionTests.cs

@@ -0,0 +1,114 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class AverageFunctionTests
+{
+    readonly Sheet sheet = new(5, 5);
+
+    [Fact]
+    public void ShouldEvaluateAverageFunctionWithTwoArguments()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 15;
+        sheet.Cells["A3"].Formula = "=AVERAGE(A1,A2)";
+
+        Assert.Equal(12.5, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAverageFunctionWithEmptyCells()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A3"].Formula = "=AVERAGE(A1,A2)";
+
+        Assert.Equal(10.0, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAverageFunctionWithMultipleArguments()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 15;
+        sheet.Cells["A3"].Value = 20;
+        sheet.Cells["A4"].Formula = "=AVERAGE(A1,A2,A3)";
+
+        Assert.Equal(15.0, sheet.Cells["A4"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnDiv0ErrorForEmptyAverageFunction()
+    {
+        sheet.Cells["A1"].Formula = "=AVERAGE()";
+
+        Assert.Equal(CellError.Div0, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnDiv0ErrorForAverageFunctionWithNoNumericValues()
+    {
+        sheet.Cells["A1"].Value = "text";
+        sheet.Cells["A2"].Value = "";
+        sheet.Cells["A3"].Formula = "=AVERAGE(A1,A2)";
+
+        Assert.Equal(CellError.Div0, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAverageFunctionWithRange()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 15;
+        sheet.Cells["A3"].Formula = "=AVERAGE(A1:A2)";
+
+        Assert.Equal(12.5, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAverageFunctionWithMixedTypes()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 15.5;
+        sheet.Cells["A3"].Formula = "=AVERAGE(A1,A2)";
+
+        Assert.Equal(12.75, sheet.Cells["A3"].Value);
+
+        sheet.Cells["A4"].Value = 2.5;
+        sheet.Cells["A5"].Formula = "=AVERAGE(A4,A1)";
+
+        Assert.Equal(6.25, sheet.Cells["A5"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAverageFunctionIgnoringTextAndLogicalValues()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = "text";
+        sheet.Cells["A3"].Value = true;
+        sheet.Cells["A4"].Value = 20;
+        sheet.Cells["A5"].Formula = "=AVERAGE(A1,A2,A3,A4)";
+
+        Assert.Equal(15.0, sheet.Cells["A5"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAverageFunctionIncludingZeroValues()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 0;
+        sheet.Cells["A3"].Value = 20;
+        sheet.Cells["A4"].Formula = "=AVERAGE(A1,A2,A3)";
+
+        Assert.Equal(10.0, sheet.Cells["A4"].Value);
+    }
+
+    [Fact]
+    public void ShouldCreateRefErrorWhenAverageRangeOutOfBounds()
+    {
+        sheet.Cells["A1"].Formula = "=AVERAGE(A2:A6)";
+
+        Assert.Equal(CellError.Ref, sheet.Cells["A1"].Value);
+    }
+}
+
+

Radzen.Blazor.Tests/Spreadsheet/CellSelectionTests.cs

@@ -0,0 +1,261 @@
+using Bunit;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class CellSelectionTests : TestContext
+{
+    private readonly Sheet sheet = new (4,4);
+
+    [Fact]
+    public void CellSelection_RendersWithCorrectClasses()
+    {
+        // Arrange
+        var cell = new CellRef(0, 0);
+        sheet.Selection.Select(new RangeRef(cell, cell));
+        var context = new MockVirtualGridContext();
+
+        // Act
+        var cut = RenderComponent<CellSelection>(parameters => parameters
+            .Add(p => p.Cell, cell)
+            .Add(p => p.Sheet, sheet)
+            .Add(p => p.Context, context));
+
+        // Assert
+        var element = cut.Find(".rz-spreadsheet-selection-cell");
+        Assert.NotNull(element);
+        Assert.Contains("rz-spreadsheet-selection-cell", element.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-top", element.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-left", element.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-bottom", element.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-right", element.ClassName);
+    }
+
+    [Fact]
+    public void CellSelection_AppliesFrozenColumnClass()
+    {
+        // Arrange
+        var cell = new CellRef(0, 0);
+        sheet.Columns.Frozen = 1;
+        sheet.Selection.Select(new RangeRef(cell, cell));
+        var context = new MockVirtualGridContext();
+
+        // Act
+        var cut = RenderComponent<CellSelection>(parameters => parameters
+            .Add(p => p.Cell, cell)
+            .Add(p => p.Sheet, sheet)
+            .Add(p => p.Context, context));
+
+        // Assert
+        var element = cut.Find(".rz-spreadsheet-selection-cell");
+        Assert.Contains("rz-spreadsheet-frozen-column", element.ClassName);
+    }
+
+    [Fact]
+    public void CellSelection_AppliesFrozenRowClass()
+    {
+        // Arrange
+        var cell = new CellRef(0, 0);
+        var context = new MockVirtualGridContext();
+        sheet.Rows.Frozen = 1;
+        sheet.Selection.Select(new RangeRef(cell, cell));
+
+        // Act
+        var cut = RenderComponent<CellSelection>(parameters => parameters
+            .Add(p => p.Cell, cell)
+            .Add(p => p.Sheet, sheet)
+            .Add(p => p.Context, context));
+
+        // Assert
+        var element = cut.Find(".rz-spreadsheet-selection-cell");
+        Assert.Contains("rz-spreadsheet-frozen-row", element.ClassName);
+    }
+
+    [Fact]
+    public void CellSelection_CalculatesStyle()
+    {
+        // Arrange
+        var cell = new CellRef(0, 0);
+        sheet.Selection.Select(new RangeRef(cell, cell));
+        var context = new MockVirtualGridContext();
+
+        // Act
+        var cut = RenderComponent<CellSelection>(parameters => parameters
+            .Add(p => p.Cell, cell)
+            .Add(p => p.Sheet, sheet)
+            .Add(p => p.Context, context));
+
+        // Assert
+        var element = cut.Find(".rz-spreadsheet-selection-cell");
+        Assert.Equal("transform: translate(0px, 0px); width: 100px; height: 24px", element.GetAttribute("style"));
+    }
+
+    [Fact]
+    public void CellSelection_SplitsMergedCell_WhenIntersectingFrozenRow()
+    {
+        // Arrange
+        sheet.Rows.Frozen = 1;
+        var range = new RangeRef(new CellRef(0, 0), new CellRef(2, 0));
+        sheet.MergedCells.Add(range);
+        sheet.Selection.Select(range);
+        var context = new MockVirtualGridContext();
+
+        // Act
+        var cut = RenderComponent<CellSelection>(parameters => parameters
+            .Add(p => p.Cell, new CellRef(0, 0))
+            .Add(p => p.Sheet, sheet)
+            .Add(p => p.Context, context));
+
+        // Assert
+        var elements = cut.FindAll(".rz-spreadsheet-selection-cell");
+        Assert.Equal(2, elements.Count);
+
+        var frozen = cut.Find(".rz-spreadsheet-frozen-row");
+
+        Assert.NotNull(frozen);
+        
+        // First element (frozen)
+        Assert.Equal("transform: translate(0px, 0px); width: 100px; height: 24px", frozen.GetAttribute("style"));
+        Assert.Contains("rz-spreadsheet-selection-cell-top", frozen.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-left", frozen.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-right", frozen.ClassName);
+        Assert.DoesNotContain("rz-spreadsheet-selection-cell-bottom", frozen.ClassName);
+
+        var unfrozen = elements.Where(e => e != frozen).FirstOrDefault();
+
+        Assert.NotNull(unfrozen);
+        
+        // Second element (non-frozen)
+        Assert.Equal("transform: translate(0px, 24px); width: 100px; height: 48px", unfrozen.GetAttribute("style"));
+        Assert.DoesNotContain("rz-spreadsheet-selection-cell-top", unfrozen.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-left", unfrozen.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-right", unfrozen.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-bottom", unfrozen.ClassName);
+    }
+
+    [Fact]
+    public void CellSelection_SplitsMergedCell_WhenIntersectingFrozenColumn()
+    {
+        // Arrange
+        sheet.Columns.Frozen = 1;
+        var range = new RangeRef(new CellRef(0, 0), new CellRef(0, 2));
+        sheet.MergedCells.Add(range);
+        sheet.Selection.Select(range);
+        var context = new MockVirtualGridContext();
+
+        // Act
+        var cut = RenderComponent<CellSelection>(parameters => parameters
+            .Add(p => p.Cell, new CellRef(0, 0))
+            .Add(p => p.Sheet, sheet)
+            .Add(p => p.Context, context));
+
+        // Assert
+        var elements = cut.FindAll(".rz-spreadsheet-selection-cell");
+        Assert.Equal(2, elements.Count);
+
+        var frozen = cut.Find(".rz-spreadsheet-frozen-column");
+
+        Assert.NotNull(frozen);
+        
+        // First element (frozen)
+        Assert.Contains("rz-spreadsheet-frozen-column", frozen.ClassName);
+        Assert.Equal("transform: translate(0px, 0px); width: 100px; height: 24px", frozen.GetAttribute("style"));
+        Assert.Contains("rz-spreadsheet-selection-cell-top", frozen.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-left", frozen.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-bottom", frozen.ClassName);
+        Assert.DoesNotContain("rz-spreadsheet-selection-cell-right", frozen.ClassName);
+        
+        var unfrozen = elements.Where(e => e != frozen).FirstOrDefault();
+
+        Assert.NotNull(unfrozen);
+        // Second element (non-frozen)
+        Assert.Equal("transform: translate(100px, 0px); width: 200px; height: 24px", unfrozen.GetAttribute("style"));
+        Assert.Contains("rz-spreadsheet-selection-cell-top", unfrozen.ClassName);
+        Assert.DoesNotContain("rz-spreadsheet-selection-cell-left", unfrozen.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-bottom", unfrozen.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-right", unfrozen.ClassName);
+    }
+
+    [Fact]
+    public void CellSelection_SplitsMergedCell_WhenIntersectingBothFrozen()
+    {
+        // Arrange
+        sheet.Rows.Frozen = 1;
+        sheet.Columns.Frozen = 1;
+        var range = new RangeRef(new CellRef(0, 0), new CellRef(2, 2));
+        sheet.MergedCells.Add(range);
+        sheet.Selection.Select(range);
+        var context = new MockVirtualGridContext();
+
+        // Act
+        var cut = RenderComponent<CellSelection>(parameters => parameters
+            .Add(p => p.Cell, new CellRef(0, 0))
+            .Add(p => p.Sheet, sheet)
+            .Add(p => p.Context, context));
+
+        // Assert
+        var elements = cut.FindAll(".rz-spreadsheet-selection-cell");
+        Assert.Equal(4, elements.Count);
+
+        // Top-left element (both frozen)
+        var both = cut.Find(".rz-spreadsheet-frozen-row.rz-spreadsheet-frozen-column");
+        Assert.NotNull(both);
+        Assert.Contains("rz-spreadsheet-frozen-row", both.ClassName);
+        Assert.Contains("rz-spreadsheet-frozen-column", both.ClassName);
+        Assert.Equal("transform: translate(0px, 0px); width: 100px; height: 24px", both.GetAttribute("style"));
+        Assert.Contains("rz-spreadsheet-selection-cell-top", both.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-left", both.ClassName);
+        Assert.DoesNotContain("rz-spreadsheet-selection-cell-bottom", both.ClassName);
+        Assert.DoesNotContain("rz-spreadsheet-selection-cell-right", both.ClassName);
+        
+        // Bottom-left element (column frozen)
+        var frozenColumn = cut.Find(".rz-spreadsheet-frozen-column:not(.rz-spreadsheet-frozen-row)");
+        Assert.NotNull(frozenColumn);
+        Assert.DoesNotContain("rz-spreadsheet-frozen-row", frozenColumn.ClassName);
+        Assert.Contains("rz-spreadsheet-frozen-column", frozenColumn.ClassName);
+        Assert.Equal("transform: translate(0px, 24px); width: 100px; height: 48px", frozenColumn.GetAttribute("style"));
+        Assert.DoesNotContain("rz-spreadsheet-selection-cell-top", frozenColumn.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-left", frozenColumn.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-bottom", frozenColumn.ClassName);
+        Assert.DoesNotContain("rz-spreadsheet-selection-cell-right", frozenColumn.ClassName);
+        
+        // Top-right element (row frozen)
+        var frozenRow = cut.Find(".rz-spreadsheet-frozen-row:not(.rz-spreadsheet-frozen-column)");
+        Assert.NotNull(frozenRow);
+        Assert.Contains("rz-spreadsheet-frozen-row", frozenRow.ClassName);
+        Assert.DoesNotContain("rz-spreadsheet-frozen-column", frozenRow.ClassName);
+        Assert.Equal("transform: translate(100px, 0px); width: 200px; height: 24px", frozenRow.GetAttribute("style"));
+        Assert.Contains("rz-spreadsheet-selection-cell-top", frozenRow.ClassName);
+        Assert.DoesNotContain("rz-spreadsheet-selection-cell-left", frozenRow.ClassName);
+        Assert.DoesNotContain("rz-spreadsheet-selection-cell-bottom", frozenRow.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-right", frozenRow.ClassName);
+        
+        // Bottom-right element (neither frozen)
+        var neither = elements.FirstOrDefault(e => e != both && e != frozenColumn && e != frozenRow);
+        Assert.NotNull(neither);
+        Assert.DoesNotContain("rz-spreadsheet-frozen-row", neither.ClassName);
+        Assert.DoesNotContain("rz-spreadsheet-frozen-column", neither.ClassName);
+        Assert.Equal("transform: translate(100px, 24px); width: 200px; height: 48px", neither.GetAttribute("style"));
+        Assert.DoesNotContain("rz-spreadsheet-selection-cell-top", neither.ClassName);
+        Assert.DoesNotContain("rz-spreadsheet-selection-cell-left", neither.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-bottom", neither.ClassName);
+        Assert.Contains("rz-spreadsheet-selection-cell-right", neither.ClassName);
+    }
+}
+
+public class MockVirtualGridContext : IVirtualGridContext
+{
+    private readonly Dictionary<(int Row, int Column), PixelRectangle> rectangle = [];
+
+    public void SetupRectangle(int row, int column, PixelRectangle rectangle)
+    {
+        this.rectangle[(row, column)] = rectangle;
+    }
+
+    public PixelRectangle GetRectangle(int row, int column) => throw new NotImplementedException();
+
+    public PixelRectangle GetRectangle(int top, int left, int bottom, int right) => new(new (left * 100, (right + 1) * 100), new (top*24, (bottom + 1)*24));
+} 

Radzen.Blazor.Tests/Spreadsheet/CellStoreTests.cs

@@ -0,0 +1,69 @@
+using System;
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class CellStoreTests
+{
+    readonly CellStore cellStore = new(new Sheet(5, 5));
+
+    [Fact]
+    public void CellStore_ShouldReturnNewCell_WhenCellDoesNotExist()
+    {
+        var cell = cellStore[0, 0];
+
+        Assert.NotNull(cell);
+    }
+
+    [Fact]
+    public void CellStore_ShouldThrowArgumentOutOfRangeException_WhenRowExceedsMax()
+    {
+        Assert.Throws<ArgumentOutOfRangeException>(() => cellStore[5, 0]);
+    }
+
+    [Fact]
+    public void CellStore_ShouldThrowArgumentOutOfRangeException_WhenColumnExceedsMax()
+    {
+        Assert.Throws<ArgumentOutOfRangeException>(() => cellStore[0, 5]);
+    }
+
+    [Fact]
+    public void CellStore_ShouldReturnExistingCell_WhenCellExists()
+    {
+        var expectedCell = new Cell(cellStore.Sheet, new CellRef(0, 0));
+        cellStore[0, 0] = expectedCell;
+        var cell = cellStore[0, 0];
+        Assert.Same(expectedCell, cell);
+    }
+
+    [Fact]
+    public void CellStore_ShouldReturnExistingCell_ViaA1Notation()
+    {
+        var expectedCell = new Cell(cellStore.Sheet, new CellRef(0, 0));
+
+        cellStore[0, 0] = expectedCell;
+
+        var cell = cellStore["A1"];
+
+        Assert.Same(expectedCell, cell);
+    }
+
+    [Fact]
+    public void CellStore_ShouldThrowException_WhenInvalidA1Notation()
+    {
+        Assert.Throws<ArgumentException>(() => cellStore["Invalid"]);
+    }
+
+    [Fact]
+    public void CellStore_ShouldSupport_MultipleLettersInA1Notation()
+    {
+        var cellStore = new CellStore(new Sheet(5, 30));
+        var expectedCell = new Cell(cellStore.Sheet, new CellRef(0, 26));
+
+        cellStore[0, 26] = expectedCell;
+
+        var cell = cellStore["AA1"];
+
+        Assert.Same(expectedCell, cell);
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/ChooseFunctionTests.cs

@@ -0,0 +1,34 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class ChooseFunctionTests
+{
+    readonly Sheet sheet = new(10, 10);
+
+    [Fact]
+    public void ShouldPickScalarByIndex()
+    {
+        sheet.Cells["A1"].Formula = "=CHOOSE(3,\"Wide\",115,\"world\",8)";
+        Assert.Equal("world", sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldPickCellReferenceByIndex()
+    {
+        sheet.Cells["A2"].Value = "1st";
+        sheet.Cells["A3"].Value = "2nd";
+        sheet.Cells["A4"].Value = "3rd";
+        sheet.Cells["A5"].Value = "Finished";
+
+        sheet.Cells["B1"].Formula = "=CHOOSE(2,A2,A3,A4,A5)";
+        Assert.Equal("2nd", sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnValueErrorWhenIndexOutOfRange()
+    {
+        sheet.Cells["A1"].Formula = "=CHOOSE(5,1,2,3)";
+        Assert.Equal(CellError.Value, sheet.Cells["A1"].Value);
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/ColumnFunctionTests.cs

@@ -0,0 +1,40 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class ColumnFunctionTests
+{
+    [Fact]
+    public void Column_OmittedReference_ReturnsCurrentColumn()
+    {
+        var sheet = new Sheet(20, 10);
+        sheet.Cells["C10"].Formula = "=COLUMN()";
+        Assert.Equal(3d, sheet.Cells["C10"].Data.Value);
+    }
+
+    [Fact]
+    public void Column_SingleCellReference_ReturnsThatColumn()
+    {
+        var sheet = new Sheet(20, 10);
+        sheet.Cells["A1"].Formula = "=COLUMN(C10)";
+        Assert.Equal(3d, sheet.Cells["A1"].Data.Value);
+    }
+
+    [Fact]
+    public void Column_RangeReference_SingleRow_ReturnsLeftmostColumn()
+    {
+        var sheet = new Sheet(20, 10);
+        sheet.Cells["B2"].Formula = "=COLUMN(C10:E10)";
+        Assert.Equal(3d, sheet.Cells["B2"].Data.Value);
+    }
+
+    [Fact]
+    public void Column_RangeReference_MultiRowAndColumn_IsError()
+    {
+        var sheet = new Sheet(20, 10);
+        sheet.Cells["B2"].Formula = "=COLUMN(C10:D20)";
+        Assert.Equal(CellError.Value, sheet.Cells["B2"].Data.Value);
+    }
+}
+
+

Radzen.Blazor.Tests/Spreadsheet/ColumnsFunctionTests.cs

@@ -0,0 +1,30 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class ColumnsFunctionTests
+{
+    [Fact]
+    public void Columns_Range_ReturnsColumnCount()
+    {
+        var sheet = new Sheet(50, 20);
+        sheet.Cells["A1"].Formula = "=COLUMNS(C1:E4)";
+        Assert.Equal(3d, sheet.Cells["A1"].Data.Value);
+    }
+
+    [Fact]
+    public void Columns_SingleCell_ReturnsOne()
+    {
+        var sheet = new Sheet(50, 20);
+        sheet.Cells["A1"].Formula = "=COLUMNS(C10)";
+        Assert.Equal(1d, sheet.Cells["A1"].Data.Value);
+    }
+
+    [Fact]
+    public void Columns_SingleColumnRange_ReturnsOne()
+    {
+        var sheet = new Sheet(50, 20);
+        sheet.Cells["A1"].Formula = "=COLUMNS(C10:C20)";
+        Assert.Equal(1d, sheet.Cells["A1"].Data.Value);
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/ConcatFunctionTests.cs

@@ -0,0 +1,44 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class ConcatFunctionTests
+{
+    [Fact]
+    public void Concat_Literals_Works()
+    {
+        var sheet = new Sheet(20, 10);
+        sheet.Cells["A1"].Formula = "=CONCAT(\"The\",\" \",\"sun\",\" \",\"will\",\" \",\"come\",\" \",\"up\",\" \",\"tomorrow.\")";
+        Assert.Equal("The sun will come up tomorrow.", sheet.Cells["A1"].Data.Value);
+    }
+
+    [Fact]
+    public void Concat_SingleRange_LinearizesRowMajor()
+    {
+        var sheet = new Sheet(20, 10);
+        sheet.Cells["B2"].Value = "a1";
+        sheet.Cells["C2"].Value = "b1";
+        sheet.Cells["B3"].Value = "a2";
+        sheet.Cells["C3"].Value = "b2";
+        sheet.Cells["B4"].Value = "a4";
+        sheet.Cells["C4"].Value = "b4";
+        sheet.Cells["B5"].Value = "a5";
+        sheet.Cells["C5"].Value = "b5";
+        sheet.Cells["B6"].Value = "a6";
+        sheet.Cells["C6"].Value = "b6";
+        sheet.Cells["B7"].Value = "a7";
+        sheet.Cells["C7"].Value = "b7";
+        sheet.Cells["A1"].Formula = "=CONCAT(B2:C7)";
+        Assert.Equal("a1b1a2b2a4b4a5b5a6b6a7b7", sheet.Cells["A1"].Data.Value);
+    }
+
+    [Fact]
+    public void Concat_MixedArgs_RangeAndLiterals()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["B2"].Value = "Andreas";
+        sheet.Cells["C2"].Value = "Hauser";
+        sheet.Cells["A1"].Formula = "=CONCAT(B2,\" \",C2)";
+        Assert.Equal("Andreas Hauser", sheet.Cells["A1"].Data.Value);
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/CountAllFunctionTests.cs

@@ -0,0 +1,150 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class CountAllFunctionTests
+{
+    readonly Sheet sheet = new(5, 5);
+
+    [Fact]
+    public void ShouldEvaluateCountaFunctionWithTwoArguments()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 15;
+        sheet.Cells["A3"].Formula = "=COUNTA(A1,A2)";
+
+        Assert.Equal(2.0, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountaFunctionWithEmptyCells()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A3"].Formula = "=COUNTA(A1,A2)";
+
+        Assert.Equal(1.0, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountaFunctionWithMultipleArguments()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 15;
+        sheet.Cells["A3"].Value = 20;
+        sheet.Cells["A4"].Formula = "=COUNTA(A1,A2,A3)";
+
+        Assert.Equal(3.0, sheet.Cells["A4"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnZeroForEmptyCountaFunction()
+    {
+        sheet.Cells["A1"].Formula = "=COUNTA()";
+
+        Assert.Equal(0.0, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountaFunctionWithRange()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 15;
+        sheet.Cells["A3"].Formula = "=COUNTA(A1:A2)";
+
+        Assert.Equal(2.0, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountaFunctionIncludingTextValues()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = "text";
+        sheet.Cells["A3"].Value = 20;
+        sheet.Cells["A4"].Formula = "=COUNTA(A1,A2,A3)";
+
+        Assert.Equal(3.0, sheet.Cells["A4"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountaFunctionIncludingLogicalValues()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = true;
+        sheet.Cells["A3"].Value = false;
+        sheet.Cells["A4"].Value = 20;
+        sheet.Cells["A5"].Formula = "=COUNTA(A1,A2,A3,A4)";
+
+        Assert.Equal(4.0, sheet.Cells["A5"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountaFunctionIncludingEmptyStrings()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = "";
+        sheet.Cells["A3"].Value = 20;
+        sheet.Cells["A4"].Formula = "=COUNTA(A1,A2,A3)";
+
+        Assert.Equal(3.0, sheet.Cells["A4"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountaFunctionIgnoringTrulyEmptyCells()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = "text";
+        sheet.Cells["A4"].Value = 20;
+        sheet.Cells["A5"].Formula = "=COUNTA(A1,A2,A3,A4)";
+
+        Assert.Equal(3.0, sheet.Cells["A5"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountaFunctionWithAllNumericValues()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 20;
+        sheet.Cells["A3"].Value = 30;
+        sheet.Cells["A4"].Formula = "=COUNTA(A1,A2,A3)";
+
+        Assert.Equal(3.0, sheet.Cells["A4"].Value);
+    }
+
+    [Fact]
+    public void ShouldShowDifferenceBetweenCountAndCounta()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = "text";
+        sheet.Cells["A3"].Value = true;
+        sheet.Cells["A4"].Value = "";
+        sheet.Cells["A5"].Value = 20;
+        sheet.Cells["B1"].Formula = "=COUNT(A1,A2,A3,A4,A5)";
+        sheet.Cells["B2"].Formula = "=COUNTA(A1,A2,A3,A4,A5)";
+
+        Assert.Equal(3.0, sheet.Cells["B1"].Value);
+        Assert.Equal(5.0, sheet.Cells["B2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountaFunctionWithMixedTypes()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = "text";
+        sheet.Cells["A3"].Value = true;
+        sheet.Cells["A4"].Value = "";
+        sheet.Cells["A5"].Value = 3.14;
+        sheet.Cells["B1"].Formula = "=COUNTA(A1,A2,A3,A4,A5)";
+
+        Assert.Equal(5.0, sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldCreateRefErrorWhenCountaRangeOutOfBounds()
+    {
+        sheet.Cells["A1"].Formula = "=COUNTA(A2:A6)";
+
+        Assert.Equal(CellError.Ref, sheet.Cells["A1"].Value);
+    }
+}
+
+

Radzen.Blazor.Tests/Spreadsheet/CountFunctionTests.cs

@@ -0,0 +1,139 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class CountFunctionTests
+{
+    readonly Sheet sheet = new(5, 5);
+
+    [Fact]
+    public void ShouldEvaluateCountFunctionWithTwoArguments()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 15;
+        sheet.Cells["A3"].Formula = "=COUNT(A1,A2)";
+
+        Assert.Equal(2.0, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountFunctionWithEmptyCells()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A3"].Formula = "=COUNT(A1,A2)";
+
+        Assert.Equal(1.0, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountFunctionWithMultipleArguments()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 15;
+        sheet.Cells["A3"].Value = 20;
+        sheet.Cells["A4"].Formula = "=COUNT(A1,A2,A3)";
+
+        Assert.Equal(3.0, sheet.Cells["A4"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnZeroForEmptyCountFunction()
+    {
+        sheet.Cells["A1"].Formula = "=COUNT()";
+
+        Assert.Equal(0.0, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountFunctionWithRange()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 15;
+        sheet.Cells["A3"].Formula = "=COUNT(A1:A2)";
+
+        Assert.Equal(2.0, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountFunctionWithMixedTypes()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 15.5;
+        sheet.Cells["A3"].Formula = "=COUNT(A1,A2)";
+
+        Assert.Equal(2.0, sheet.Cells["A3"].Value);
+
+        sheet.Cells["A4"].Value = 2.5;
+        sheet.Cells["A5"].Formula = "=COUNT(A4,A1)";
+
+        Assert.Equal(2.0, sheet.Cells["A5"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountFunctionIncludingLogicalValues()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = true;
+        sheet.Cells["A3"].Value = false;
+        sheet.Cells["A4"].Value = 20;
+        sheet.Cells["A5"].Formula = "=COUNT(A1,A2,A3,A4)";
+
+        Assert.Equal(4.0, sheet.Cells["A5"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountFunctionIncludingTextRepresentationsOfNumbers()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = "15";
+        sheet.Cells["A3"].Value = "text";
+        sheet.Cells["A4"].Value = "3.14";
+        sheet.Cells["A5"].Formula = "=COUNT(A1,A2,A3,A4)";
+
+        Assert.Equal(3.0, sheet.Cells["A5"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountFunctionIgnoringTextAndEmptyCells()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = "text";
+        sheet.Cells["A3"].Value = "";
+        sheet.Cells["A4"].Value = 20;
+        sheet.Cells["A5"].Formula = "=COUNT(A1,A2,A3,A4)";
+
+        Assert.Equal(2.0, sheet.Cells["A5"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountFunctionIncludingZeroValues()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 0;
+        sheet.Cells["A3"].Value = 20;
+        sheet.Cells["A4"].Formula = "=COUNT(A1,A2,A3)";
+
+        Assert.Equal(3.0, sheet.Cells["A4"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateCountFunctionWithAllNumericValues()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 20;
+        sheet.Cells["A3"].Value = 30;
+        sheet.Cells["A4"].Formula = "=COUNT(A1,A2,A3)";
+
+        Assert.Equal(3.0, sheet.Cells["A4"].Value);
+    }
+
+    [Fact]
+    public void ShouldCreateRefErrorWhenCountRangeOutOfBounds()
+    {
+        sheet.Cells["A1"].Formula = "=COUNT(A2:A6)";
+
+        Assert.Equal(CellError.Ref, sheet.Cells["A1"].Value);
+    }
+}
+
+

Radzen.Blazor.Tests/Spreadsheet/DayFunctionTests.cs

@@ -0,0 +1,32 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class DayFunctionTests
+{
+    [Fact]
+    public void Day_FromDateSerial_ReturnsDay()
+    {
+        var sheet = new Sheet(10, 10);
+        // Using DATEVALUE via VALUE on a date string to get a serial
+        sheet.Cells["A1"].Formula = "=DAY(VALUE(\"2011-04-15\"))";
+        Assert.Equal(15, sheet.Cells["A1"].Data.GetValueOrDefault<double>());
+    }
+
+    [Fact]
+    public void Day_FromDateValue_ReturnsDay()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A1"].Data = CellData.FromDate(new System.DateTime(2011, 4, 15));
+        sheet.Cells["B1"].Formula = "=DAY(A1)";
+        Assert.Equal(15, sheet.Cells["B1"].Data.GetValueOrDefault<double>());
+    }
+
+    [Fact]
+    public void Day_InvalidText_ReturnsValueError()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A1"].Formula = "=DAY(\"abc\")";
+        Assert.Equal(CellError.Value, sheet.Cells["A1"].Data.GetValueOrDefault<CellError>());
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/DeleteRowColumnTests.cs

@@ -0,0 +1,81 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class DeleteRowColumnTests
+{
+    [Fact]
+    public void DeleteColumn_ShiftsDataAndDecreasesColumnCount()
+    {
+        var sheet = new Sheet(3, 4);
+        sheet.Cells[0, 0].Value = "A";
+        sheet.Cells[0, 1].Value = "B";
+        sheet.Cells[0, 2].Value = "C";
+        sheet.Cells[0, 3].Value = "D";
+
+        sheet.DeleteColumn(1); // delete column B
+
+        Assert.Equal(3, sheet.ColumnCount);
+        Assert.Equal("A", sheet.Cells[0, 0].Value);
+        Assert.Equal("C", sheet.Cells[0, 1].Value);
+        Assert.Equal("D", sheet.Cells[0, 2].Value);
+    }
+
+    [Fact]
+    public void DeleteRow_ShiftsDataAndDecreasesRowCount()
+    {
+        var sheet = new Sheet(4, 2);
+        sheet.Cells[0, 0].Value = "R1";
+        sheet.Cells[1, 0].Value = "R2";
+        sheet.Cells[2, 0].Value = "R3";
+        sheet.Cells[3, 0].Value = "R4";
+
+        sheet.DeleteRow(1); // delete row 2
+
+        Assert.Equal(3, sheet.RowCount);
+        Assert.Equal("R1", sheet.Cells[0, 0].Value);
+        Assert.Equal("R3", sheet.Cells[1, 0].Value);
+        Assert.Equal("R4", sheet.Cells[2, 0].Value);
+    }
+
+    [Fact]
+    public void DeleteColumn_DoesNotAdjustFormulas_RefsBecomeError()
+    {
+        var sheet = new Sheet(5, 5);
+        sheet.Cells[0, 0].Value = 1;   // A1
+        sheet.Cells[0, 1].Value = 2;   // B1
+        sheet.Cells[0, 2].Value = 3;   // C1
+
+        // Formula in B2 references A1 and C1
+        sheet.Cells[1, 1].Formula = "=A1+C1";
+        Assert.Equal(4d, sheet.Cells[1, 1].Value);
+
+        // Delete referenced column A -> A1 becomes invalid => #REF!
+        sheet.DeleteColumn(0);
+
+        Assert.Equal(CellError.Ref, sheet.Cells[1, 0].Value);
+        Assert.Equal("=#REF!+C1", sheet.Cells[1, 0].Formula);
+    }
+
+    [Fact]
+    public void DeleteRow_DoesNotAdjustFormulas_RefsBecomeError()
+    {
+        var sheet = new Sheet(5, 5);
+        sheet.Cells[0, 0].Value = 1;   // A1
+        sheet.Cells[1, 0].Value = 2;   // A2
+        sheet.Cells[2, 0].Value = 3;   // A3
+
+        // Formula in B2 references A1 and A3
+        sheet.Cells[1, 1].Formula = "=A1+A3";
+        Assert.Equal(4d, sheet.Cells[1, 1].Value);
+
+        // Delete referenced row 1 -> A1 becomes invalid => #REF!
+        sheet.DeleteRow(0);
+
+        Assert.Equal(CellError.Ref, sheet.Cells[0, 1].Value);
+        Assert.Equal("=#REF!+A3", sheet.Cells[0, 1].Formula);
+    }
+
+}
+
+

Radzen.Blazor.Tests/Spreadsheet/FilterCommandTests.cs

@@ -0,0 +1,146 @@
+using System;
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class FilterCommandTests
+{
+    private readonly Sheet sheet = new(10, 10);
+
+    [Fact]
+    public void Should_AddFilterWithCommand()
+    {
+        // Initially no filters
+        Assert.Empty(sheet.Filters);
+
+        // Create a filter
+        var filter = new SheetFilter(
+            new EqualToCriterion { Column = 0, Value = "Test" },
+            RangeRef.Parse("A1:A5")
+        );
+
+        // Execute the command
+        var command = new FilterCommand(sheet, filter);
+        var result = command.Execute();
+
+        // Command should succeed
+        Assert.True(result);
+
+        // Filter should be added
+        Assert.Single(sheet.Filters);
+        Assert.Contains(filter, sheet.Filters);
+    }
+
+    [Fact]
+    public void Should_UndoFilterCommand()
+    {
+        // Initially no filters
+        Assert.Empty(sheet.Filters);
+
+        // Create a filter
+        var filter = new SheetFilter(
+            new EqualToCriterion { Column = 0, Value = "Test" },
+            RangeRef.Parse("A1:A5")
+        );
+
+        // Execute the command
+        var command = new FilterCommand(sheet, filter);
+        command.Execute();
+
+        // Filter should be added
+        Assert.Single(sheet.Filters);
+
+        // Undo the command
+        command.Unexecute();
+
+        // Filter should be removed
+        Assert.Empty(sheet.Filters);
+    }
+
+    [Fact]
+    public void Should_WorkWithUndoRedoStack()
+    {
+        // Initially no filters
+        Assert.Empty(sheet.Filters);
+
+        // Create a filter
+        var filter = new SheetFilter(
+            new EqualToCriterion { Column = 0, Value = "Test" },
+            RangeRef.Parse("A1:A5")
+        );
+
+        // Execute the command through the undo/redo stack
+        var command = new FilterCommand(sheet, filter);
+        var result = sheet.Commands.Execute(command);
+
+        // Command should succeed
+        Assert.True(result);
+
+        // Filter should be added
+        Assert.Single(sheet.Filters);
+
+        // Undo should be available
+        Assert.True(sheet.Commands.CanUndo);
+
+        // Undo the command
+        sheet.Commands.Undo();
+
+        // Filter should be removed
+        Assert.Empty(sheet.Filters);
+
+        // Redo should be available
+        Assert.True(sheet.Commands.CanRedo);
+
+        // Redo the command
+        sheet.Commands.Redo();
+
+        // Filter should be added again
+        Assert.Single(sheet.Filters);
+    }
+
+    [Fact]
+    public void Should_HandleMultipleFilters()
+    {
+        // Initially no filters
+        Assert.Empty(sheet.Filters);
+
+        // Create multiple filters
+        var filter1 = new SheetFilter(
+            new EqualToCriterion { Column = 0, Value = "Test1" },
+            RangeRef.Parse("A1:A5")
+        );
+
+        var filter2 = new SheetFilter(
+            new EqualToCriterion { Column = 1, Value = "Test2" },
+            RangeRef.Parse("B1:B5")
+        );
+
+        // Execute commands through the undo/redo stack
+        var command1 = new FilterCommand(sheet, filter1);
+        var command2 = new FilterCommand(sheet, filter2);
+
+        sheet.Commands.Execute(command1);
+        sheet.Commands.Execute(command2);
+
+        // Both filters should be added
+        Assert.Equal(2, sheet.Filters.Count);
+        Assert.Contains(filter1, sheet.Filters);
+        Assert.Contains(filter2, sheet.Filters);
+
+        // Undo both commands
+        sheet.Commands.Undo(); // Undo filter2
+        sheet.Commands.Undo(); // Undo filter1
+
+        // No filters should remain
+        Assert.Empty(sheet.Filters);
+
+        // Redo both commands
+        sheet.Commands.Redo(); // Redo filter1
+        sheet.Commands.Redo(); // Redo filter2
+
+        // Both filters should be back
+        Assert.Equal(2, sheet.Filters.Count);
+        Assert.Contains(filter1, sheet.Filters);
+        Assert.Contains(filter2, sheet.Filters);
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/FindFunctionTests.cs

@@ -0,0 +1,51 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class FindFunctionTests
+{
+    [Fact]
+    public void Find_CaseSensitive_MatchesUppercase()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A2"].Value = "Miriam McGovern";
+        sheet.Cells["B1"].Formula = "=FIND(\"M\",A2)";
+        Assert.Equal(1d, sheet.Cells["B1"].Data.Value);
+    }
+
+    [Fact]
+    public void Find_CaseSensitive_MatchesLowercase()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A2"].Value = "Miriam McGovern";
+        sheet.Cells["B1"].Formula = "=FIND(\"m\",A2)";
+        Assert.Equal(6d, sheet.Cells["B1"].Data.Value);
+    }
+
+    [Fact]
+    public void Find_WithStartNum()
+    {
+        var sheet = new Sheet(10, 30);
+        sheet.Cells["A1"].Value = "AYF0093.YoungMensApparel";
+        sheet.Cells["B1"].Formula = "=FIND(\"Y\",A1,8)";
+        Assert.Equal(9d, sheet.Cells["B1"].Data.Value);
+    }
+
+    [Fact]
+    public void Find_EmptyFindText_ReturnsStart()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A1"].Value = "abc";
+        sheet.Cells["B1"].Formula = "=FIND(\"\",A1,2)";
+        Assert.Equal(2d, sheet.Cells["B1"].Data.Value);
+    }
+
+    [Fact]
+    public void Find_NotFound_ReturnsValue()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A1"].Value = "abc";
+        sheet.Cells["B1"].Formula = "=FIND(\"z\",A1)";
+        Assert.Equal(CellError.Value, sheet.Cells["B1"].Data.GetValueOrDefault<CellError>());
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/FormulaEvaluatorTests.cs

@@ -0,0 +1,298 @@
+using System;
+using System.Linq.Expressions;
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class FormulaEvaluationTests
+{
+    readonly Sheet sheet = new(5, 5);
+
+    [Fact]
+    public void ShouldEvaluateFormulaAfterSettingIt()
+    {
+        sheet.Cells["A1"].Value = 1;
+        sheet.Cells["A2"].Formula = "=A1+1";
+
+        Assert.Equal(2d, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateFormulaAfterSettingValue()
+    {
+        sheet.Cells["A1"].Formula = "=A2+1";
+        sheet.Cells["A2"].Value = 1;
+
+        Assert.Equal(2d, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldNotEvaluateFormulaIfEditing()
+    {
+        sheet.BeginUpdate();
+        sheet.Cells["A1"].Formula = "=A2+1";
+        sheet.Cells["A2"].Value = 1;
+
+        Assert.Null(sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateFormulaAfterEndingEdit()
+    {
+        sheet.BeginUpdate();
+        sheet.Cells["A1"].Formula = "=A2+1";
+        sheet.Cells["A2"].Value = 1;
+        sheet.EndUpdate();
+
+        Assert.Equal(2d, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldSetCellValueToErrorValueIfStringIsUsedInBinaryOperation()
+    {
+        sheet.Cells["A1"].Formula = "=A2+1";
+        sheet.Cells["A2"].Value = "test";
+
+        Assert.Equal(CellError.Value, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldSetCellValueToErrorNameIfInvalidFunctionIsUsedInFormula()
+    {
+        sheet.Cells["A1"].Formula = "=INVALID_FUNCTION()";
+        sheet.Cells["A2"].Value = "test";
+
+        Assert.Equal(CellError.Name, sheet.Cells["A1"].Value);
+    }
+
+    [Theory]
+    [InlineData("=SUM(")]
+    [InlineData("=SUM(A2,")]
+    [InlineData("=SUM(A2:A2")]
+    public void ShouldSetCellValueToErrorNameIfIncompleteFunctionIsUsedInFormula(string formula)
+    {
+        sheet.Cells["A1"].Formula = formula;
+        sheet.Cells["A2"].Value = "test";
+
+        Assert.Equal(CellError.Name, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldSetCellValueToEqualsIfOnlyEqualsIsSetAsFormula()
+    {
+        sheet.Cells["A1"].SetValue("=");
+
+        Assert.Equal("=", sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateFormulaWhenDependencyIsChanged()
+    {
+        sheet.Cells["A1"].Formula = "=A2+1";
+        sheet.Cells["A2"].Formula = "=A3+1";
+        sheet.Cells["A3"].Value = 1;
+
+        Assert.Equal(3d, sheet.Cells["A1"].Value);
+        Assert.Equal(2d, sheet.Cells["A2"].Value);
+        Assert.Equal(1d, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateFormulaWhenDependencyIsChangedAndEndEditIsCalled()
+    {
+        sheet.BeginUpdate();
+        sheet.Cells["A1"].Formula = "=A2+1";
+        sheet.Cells["A2"].Formula = "=A3+1";
+        sheet.Cells["A3"].Value = 1;
+        sheet.EndUpdate();
+
+        Assert.Equal(3d, sheet.Cells["A1"].Value);
+        Assert.Equal(2d, sheet.Cells["A2"].Value);
+        Assert.Equal(1d, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldTreatEmptyValueAsZeroInFormula()
+    {
+        sheet.Cells["A1"].Formula = "=A2+1";
+
+        Assert.Equal(1d, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldHandleSelfReferencingFormulas()
+    {
+        sheet.Cells["A1"].Formula = "=A1+1";
+
+        // Setting a value should not cause infinite recursion
+        sheet.Cells["A1"].Value = 1;
+
+        // The value should be stable and not cause infinite recursion
+        Assert.NotNull(sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldSetDiv0ErrorWhenDividingByZero()
+    {
+        sheet.Cells["A1"].Formula = "=A2/A3";
+        sheet.Cells["A2"].Value = 1;
+        sheet.Cells["A3"].Value = 0;
+
+        Assert.Equal(CellError.Div0, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldSetErrorToCircularWhenCellFormulasReferenceEachOther()
+    {
+        sheet.Cells["A1"].Formula = "=A2+1";
+        sheet.Cells["A2"].Formula = "=A1+1";
+
+        // The value should be an error
+        Assert.Equal(CellError.Circular, sheet.Cells["A1"].Value);
+        Assert.Equal(CellError.Circular, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnNameErrorForUnknownFunction()
+    {
+        sheet.Cells["A1"].Formula = "=UNKNOWN()";
+
+        Assert.Equal(CellError.Name, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldCreateRefErrorWhenOutOfBounds()
+    {
+        sheet.Cells["A1"].Formula = "=A6";
+
+        Assert.Equal(CellError.Ref, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldCreateRefErrorWhenRangeOutOfBounds()
+    {
+        sheet.Cells["A1"].Formula = "=SUM(A2:A6)";
+
+        Assert.Equal(CellError.Ref, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldCreateRefErrorWhenCountRangeOutOfBounds()
+    {
+        sheet.Cells["A1"].Formula = "=COUNT(A2:A6)";
+
+        Assert.Equal(CellError.Ref, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldCreateRefErrorWhenCountaRangeOutOfBounds()
+    {
+        sheet.Cells["A1"].Formula = "=COUNTA(A2:A6)";
+
+        Assert.Equal(CellError.Ref, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfFunctionWithDecimalValues()
+    {
+        sheet.Cells["A1"].Value = 0.5m;
+        sheet.Cells["A2"].Formula = "=IF(A1,\"True\",\"False\")";
+
+        Assert.Equal("True", sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnNameErrorForUnknownFunctionUppercase()
+    {
+        sheet.Cells["A1"].Formula = "=UNKNOWNFUNCTION(1,2,3)";
+
+        Assert.Equal(CellError.Name, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnNameErrorForUnknownFunctionWithMixedCase()
+    {
+        sheet.Cells["A1"].Formula = "=UnknownFunction(1,2,3)";
+
+        Assert.Equal(CellError.Name, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnNameErrorForUnknownFunctionWithLowercase()
+    {
+        sheet.Cells["A1"].Formula = "=unknownfunction(1,2,3)";
+
+        Assert.Equal(CellError.Name, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateAndFunctionInIfStatementWithFalseCondition()
+    {
+        sheet.Cells["A1"].Value = 5;
+        sheet.Cells["A2"].Value = 150;
+        sheet.Cells["A3"].Formula = "=IF(AND(A1>1,A2<100),A1,\"Out of range\")";
+
+        Assert.Equal("Out of range", sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateOrFunctionWithProvidedExample3()
+    {
+        sheet.Cells["A2"].Value = 75;
+        sheet.Cells["A3"].Formula = "=IF(OR(A2<0,A2>50),A2,\"The value is out of range\")";
+
+        Assert.Equal(75d, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithOrFunction()
+    {
+        sheet.Cells["A1"].Value = false;
+        sheet.Cells["A2"].Value = false;
+        sheet.Cells["A3"].Formula = "=NOT(OR(A1,A2))";
+
+        Assert.Equal(true, sheet.Cells["A3"].Value);
+    }
+
+    // IFERROR function tests are in IfErrorFunctionTests.cs
+
+    [Fact]
+    public void ShouldEvaluateSimpleDivisionByZero()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Formula = "=A1/0";
+
+        Assert.Equal(CellError.Div0, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void Evaluator_ShouldResolveCrossSheetCellReference()
+    {
+        var wb = new Workbook();
+        var s1 = wb.AddSheet("Sheet1", 5, 5);
+        var s2 = wb.AddSheet("Sheet2", 5, 5);
+
+        s2.Cells[0, 2].Value = 42; // C1 on Sheet2
+
+        s1.Cells[0, 0].Formula = "=Sheet2!C1"; // A1 on Sheet1 refers to Sheet2!C1
+
+        Assert.Equal(42d, s1.Cells[0, 0].Data.GetValueOrDefault<double>());
+    }
+
+    [Fact]
+    public void Evaluator_ShouldResolveCrossSheetRangeInFunction()
+    {
+        var wb = new Workbook();
+        var s1 = wb.AddSheet("Sheet1", 5, 5);
+        var s2 = wb.AddSheet("Sheet2", 5, 5);
+
+        s2.Cells[0, 0].Value = 1; // A1
+        s2.Cells[0, 1].Value = 2; // B1
+        s2.Cells[1, 0].Value = 3; // A2
+        s2.Cells[1, 1].Value = 4; // B2
+
+        s1.Cells[0, 0].Formula = "=SUM(Sheet2!A1:Sheet2!B2)";
+
+        Assert.Equal(10d, s1.Cells[0, 0].Data.GetValueOrDefault<double>());
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/FormulaLexerTests.cs

@@ -0,0 +1,143 @@
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+using System;
+using Xunit;
+
+public class FormulaLexerTests
+{
+    [Fact]
+    public void FormulaLexer_ShouldParseCellIdentifier()
+    {
+        var tokens = FormulaLexer.Scan("=A1");
+        Assert.Equal(FormulaTokenType.Equals, tokens[0].Type);
+        Assert.Equal(0, tokens[0].Start);
+        Assert.Equal(1, tokens[0].End);
+        Assert.Equal(FormulaTokenType.CellIdentifier, tokens[1].Type);
+        Assert.Equal("A1", tokens[1].Address.ToString());
+        Assert.Equal(1, tokens[1].Start);
+        Assert.Equal(3, tokens[1].End);
+    }
+
+    [Fact]
+    public void FormulaLexer_ShouldParseSimpleFormula()
+    {
+        var tokens = FormulaLexer.Scan("=A1+b2");
+        Assert.Equal(FormulaTokenType.Equals, tokens[0].Type);
+        Assert.Equal(0, tokens[0].Start);
+        Assert.Equal(1, tokens[0].End);
+        Assert.Equal(FormulaTokenType.CellIdentifier, tokens[1].Type);
+        Assert.Equal("A1", tokens[1].Value);
+        Assert.Equal(1, tokens[1].Start);
+        Assert.Equal(3, tokens[1].End);
+        Assert.Equal(FormulaTokenType.Plus, tokens[2].Type);
+        Assert.Equal(3, tokens[2].Start);
+        Assert.Equal(4, tokens[2].End);
+        Assert.Equal(FormulaTokenType.CellIdentifier, tokens[3].Type);
+        Assert.Equal("b2", tokens[3].Value);
+        Assert.Equal(4, tokens[3].Start);
+        Assert.Equal(6, tokens[3].End);
+    }
+
+    [Fact]
+    public void FormulaLexer_ShouldPreserveWhitespaceAsTrivia()
+    {
+        var tokens = FormulaLexer.Scan("= A1 + b2 ");
+
+        // Check that whitespace is preserved as trivia
+        Assert.Equal(FormulaTokenType.Equals, tokens[0].Type);
+        Assert.Empty(tokens[0].LeadingTrivia);
+        Assert.Single(tokens[0].TrailingTrivia);
+        Assert.Equal(FormulaTokenTriviaKind.Whitespace, tokens[0].TrailingTrivia[0].Kind);
+        Assert.Equal(" ", tokens[0].TrailingTrivia[0].Text);
+        Assert.Equal(0, tokens[0].Start);
+        Assert.Equal(2, tokens[0].End);
+
+        Assert.Equal(FormulaTokenType.CellIdentifier, tokens[1].Type);
+        Assert.Empty(tokens[1].LeadingTrivia);
+        Assert.Single(tokens[1].TrailingTrivia);
+        Assert.Equal(FormulaTokenTriviaKind.Whitespace, tokens[1].TrailingTrivia[0].Kind);
+        Assert.Equal(" ", tokens[1].TrailingTrivia[0].Text);
+        Assert.Equal(2, tokens[1].Start);
+        Assert.Equal(5, tokens[1].End);
+
+        Assert.Equal(FormulaTokenType.Plus, tokens[2].Type);
+        Assert.Empty(tokens[2].LeadingTrivia);
+        Assert.Single(tokens[2].TrailingTrivia);
+        Assert.Equal(FormulaTokenTriviaKind.Whitespace, tokens[2].TrailingTrivia[0].Kind);
+        Assert.Equal(" ", tokens[2].TrailingTrivia[0].Text);
+        Assert.Equal(5, tokens[2].Start);
+        Assert.Equal(7, tokens[2].End);
+
+        Assert.Equal(FormulaTokenType.CellIdentifier, tokens[3].Type);
+        Assert.Empty(tokens[3].LeadingTrivia);
+        Assert.Single(tokens[3].TrailingTrivia);
+        Assert.Equal(FormulaTokenTriviaKind.Whitespace, tokens[3].TrailingTrivia[0].Kind);
+        Assert.Equal(" ", tokens[3].TrailingTrivia[0].Text);
+        Assert.Equal(7, tokens[3].Start);
+        Assert.Equal(10, tokens[3].End);
+    }
+
+    [Fact]
+    public void FormulaLexer_ShouldPreserveMultipleWhitespaceAsTrivia()
+    {
+        var tokens = FormulaLexer.Scan("=  A1  +  b2  ");
+
+        // Check that multiple whitespace characters are preserved
+        Assert.Equal(FormulaTokenType.Equals, tokens[0].Type);
+        Assert.Single(tokens[0].TrailingTrivia);
+        Assert.Equal("  ", tokens[0].TrailingTrivia[0].Text);
+        Assert.Equal(0, tokens[0].Start);
+        Assert.Equal(3, tokens[0].End);
+
+        Assert.Equal(FormulaTokenType.CellIdentifier, tokens[1].Type);
+        Assert.Single(tokens[1].TrailingTrivia);
+        Assert.Equal("  ", tokens[1].TrailingTrivia[0].Text);
+        Assert.Equal(3, tokens[1].Start);
+        Assert.Equal(7, tokens[1].End);
+
+        Assert.Equal(FormulaTokenType.Plus, tokens[2].Type);
+        Assert.Single(tokens[2].TrailingTrivia);
+        Assert.Equal("  ", tokens[2].TrailingTrivia[0].Text);
+        Assert.Equal(7, tokens[2].Start);
+        Assert.Equal(10, tokens[2].End);
+
+        Assert.Equal(FormulaTokenType.CellIdentifier, tokens[3].Type);
+        Assert.Single(tokens[3].TrailingTrivia);
+        Assert.Equal("  ", tokens[3].TrailingTrivia[0].Text);
+        Assert.Equal(10, tokens[3].Start);
+        Assert.Equal(14, tokens[3].End);
+    }
+
+    [Fact]
+    public void FormulaLexer_ShouldPreserveLineEndingsAsTrivia()
+    {
+        var tokens = FormulaLexer.Scan("=A1\n+b2");
+
+        // Check that line endings are preserved as trivia
+        Assert.Equal(FormulaTokenType.Equals, tokens[0].Type);
+        Assert.Empty(tokens[0].LeadingTrivia);
+        Assert.Empty(tokens[0].TrailingTrivia);
+        Assert.Equal(0, tokens[0].Start);
+        Assert.Equal(1, tokens[0].End);
+
+        Assert.Equal(FormulaTokenType.CellIdentifier, tokens[1].Type);
+        Assert.Empty(tokens[1].LeadingTrivia);
+        Assert.Single(tokens[1].TrailingTrivia);
+        Assert.Equal(FormulaTokenTriviaKind.EndOfLine, tokens[1].TrailingTrivia[0].Kind);
+        Assert.Equal("\n", tokens[1].TrailingTrivia[0].Text);
+        Assert.Equal(1, tokens[1].Start);
+        Assert.Equal(4, tokens[1].End);
+
+        Assert.Equal(FormulaTokenType.Plus, tokens[2].Type);
+        Assert.Empty(tokens[2].LeadingTrivia);
+        Assert.Empty(tokens[2].TrailingTrivia);
+        Assert.Equal(4, tokens[2].Start);
+        Assert.Equal(5, tokens[2].End);
+
+        Assert.Equal(expected: FormulaTokenType.CellIdentifier, tokens[3].Type);
+        Assert.Empty(tokens[3].LeadingTrivia);
+        Assert.Empty(tokens[3].TrailingTrivia);
+        Assert.Equal(5, tokens[3].Start);
+        Assert.Equal(7, tokens[3].End);
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/FormulaParserTests.cs

@@ -0,0 +1,644 @@
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+using System;
+using Xunit;
+
+public class FormulaParserTests
+{
+    [Fact]
+    public void FormulaParser_ShouldRequireEqualsAtStart()
+    {
+        var formula = "A1";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.NotEmpty(syntaxTree.Errors);
+        Assert.Contains("Unexpected token", syntaxTree.Errors[0]);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseNumberLiteral()
+    {
+        var formula = "=123";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        Assert.IsType<NumberLiteralSyntaxNode>(syntaxTree.Root);
+        var numberNode = (NumberLiteralSyntaxNode)syntaxTree.Root;
+        Assert.Equal(123, numberNode.Token.IntValue);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseAdditionOfTwoNumberLiterals()
+    {
+        var formula = "=123+456";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        Assert.IsType<BinaryExpressionSyntaxNode>(syntaxTree.Root);
+        var binaryNode = (BinaryExpressionSyntaxNode)syntaxTree.Root;
+        Assert.Equal(BinaryOperator.Plus, binaryNode.Operator);
+        Assert.IsType<NumberLiteralSyntaxNode>(binaryNode.Left);
+        Assert.IsType<NumberLiteralSyntaxNode>(binaryNode.Right);
+        Assert.Equal(123, ((NumberLiteralSyntaxNode)binaryNode.Left).Token.IntValue);
+        Assert.Equal(456, ((NumberLiteralSyntaxNode)binaryNode.Right).Token.IntValue);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseAdditionOfMultipleNumberLiterals()
+    {
+        var formula = "=123+456+789";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<BinaryExpressionSyntaxNode>(node);
+        var binaryNode = (BinaryExpressionSyntaxNode)node;
+        Assert.Equal(BinaryOperator.Plus, binaryNode.Operator);
+        Assert.IsType<BinaryExpressionSyntaxNode>(binaryNode.Left);
+        var leftBinaryNode = (BinaryExpressionSyntaxNode)binaryNode.Left;
+        Assert.Equal(BinaryOperator.Plus, leftBinaryNode.Operator);
+        Assert.Equal(123, ((NumberLiteralSyntaxNode)leftBinaryNode.Left).Token.IntValue);
+        Assert.Equal(456, ((NumberLiteralSyntaxNode)leftBinaryNode.Right).Token.IntValue);
+        Assert.Equal(789, ((NumberLiteralSyntaxNode)binaryNode.Right).Token.IntValue);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseSubtractionOfTwoNumberLiterals()
+    {
+        var formula = "=123-456";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<BinaryExpressionSyntaxNode>(node);
+        var binaryNode = (BinaryExpressionSyntaxNode)node;
+        Assert.Equal(BinaryOperator.Minus, binaryNode.Operator);
+        Assert.IsType<NumberLiteralSyntaxNode>(binaryNode.Left);
+        Assert.IsType<NumberLiteralSyntaxNode>(binaryNode.Right);
+        Assert.Equal(123, ((NumberLiteralSyntaxNode)binaryNode.Left).Token.IntValue);
+        Assert.Equal(456, ((NumberLiteralSyntaxNode)binaryNode.Right).Token.IntValue);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseUnaryNegativeNumber()
+    {
+        var formula = "=-123";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        Assert.IsType<UnaryExpressionSyntaxNode>(syntaxTree.Root);
+        var unary = (UnaryExpressionSyntaxNode)syntaxTree.Root;
+        Assert.Equal(UnaryOperator.Negate, unary.Operator);
+        Assert.IsType<NumberLiteralSyntaxNode>(unary.Operand);
+        Assert.Equal(123, ((NumberLiteralSyntaxNode)unary.Operand).Token.IntValue);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseUnaryPlusNumber()
+    {
+        var formula = "=+123";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        Assert.IsType<UnaryExpressionSyntaxNode>(syntaxTree.Root);
+        var unary = (UnaryExpressionSyntaxNode)syntaxTree.Root;
+        Assert.Equal(UnaryOperator.Plus, unary.Operator);
+        Assert.IsType<NumberLiteralSyntaxNode>(unary.Operand);
+        Assert.Equal(123, ((NumberLiteralSyntaxNode)unary.Operand).Token.IntValue);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseUnaryPlusInFunctionArgument()
+    {
+        var formula = "=LEFT(A1,+1)";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        Assert.IsType<FunctionSyntaxNode>(syntaxTree.Root);
+        var fn = (FunctionSyntaxNode)syntaxTree.Root;
+        Assert.Equal("LEFT", fn.Name);
+        Assert.IsType<UnaryExpressionSyntaxNode>(fn.Arguments[1]);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseMultipleUnaryOperators()
+    {
+        var formula = "=-+-+3";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        // Expect nested unary nodes: - ( + ( - ( + 3 ) ) )
+        var node = syntaxTree.Root;
+        Assert.IsType<UnaryExpressionSyntaxNode>(node);
+        var u1 = (UnaryExpressionSyntaxNode)node; // '-'
+        Assert.Equal(UnaryOperator.Negate, u1.Operator);
+        Assert.IsType<UnaryExpressionSyntaxNode>(u1.Operand);
+        var u2 = (UnaryExpressionSyntaxNode)u1.Operand; // '+'
+        Assert.Equal(UnaryOperator.Plus, u2.Operator);
+        Assert.IsType<UnaryExpressionSyntaxNode>(u2.Operand);
+        var u3 = (UnaryExpressionSyntaxNode)u2.Operand; // '-'
+        Assert.Equal(UnaryOperator.Negate, u3.Operator);
+        Assert.IsType<UnaryExpressionSyntaxNode>(u3.Operand);
+        var u4 = (UnaryExpressionSyntaxNode)u3.Operand; // '+'
+        Assert.Equal(UnaryOperator.Plus, u4.Operator);
+        Assert.IsType<NumberLiteralSyntaxNode>(u4.Operand);
+        Assert.Equal(3, ((NumberLiteralSyntaxNode)u4.Operand).Token.IntValue);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseUnaryNegativeInFunctionArgument()
+    {
+        var formula = "=LEFT(A1,-1)";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        Assert.IsType<FunctionSyntaxNode>(syntaxTree.Root);
+        var fn = (FunctionSyntaxNode)syntaxTree.Root;
+        Assert.Equal("LEFT", fn.Name);
+        Assert.Equal(2, fn.Arguments.Count);
+        Assert.IsType<CellSyntaxNode>(fn.Arguments[0]);
+        Assert.IsType<UnaryExpressionSyntaxNode>(fn.Arguments[1]);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseSubtractionOfMultipleNumberLiterals()
+    {
+        var formula = "=123-456-789";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<BinaryExpressionSyntaxNode>(node);
+        var binaryNode = (BinaryExpressionSyntaxNode)node;
+        Assert.Equal(BinaryOperator.Minus, binaryNode.Operator);
+        Assert.IsType<BinaryExpressionSyntaxNode>(binaryNode.Left);
+        var leftBinaryNode = (BinaryExpressionSyntaxNode)binaryNode.Left;
+        Assert.Equal(BinaryOperator.Minus, leftBinaryNode.Operator);
+        Assert.Equal(123, ((NumberLiteralSyntaxNode)leftBinaryNode.Left).Token.IntValue);
+        Assert.Equal(456, ((NumberLiteralSyntaxNode)leftBinaryNode.Right).Token.IntValue);
+        Assert.Equal(789, ((NumberLiteralSyntaxNode)binaryNode.Right).Token.IntValue);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseMultiplicationOfTwoNumberLiterals()
+    {
+        var formula = "=123*456";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<BinaryExpressionSyntaxNode>(node);
+        var binaryNode = (BinaryExpressionSyntaxNode)node;
+        Assert.Equal(BinaryOperator.Multiply, binaryNode.Operator);
+        Assert.IsType<NumberLiteralSyntaxNode>(binaryNode.Left);
+        Assert.IsType<NumberLiteralSyntaxNode>(binaryNode.Right);
+        Assert.Equal(123, ((NumberLiteralSyntaxNode)binaryNode.Left).Token.IntValue);
+        Assert.Equal(456, ((NumberLiteralSyntaxNode)binaryNode.Right).Token.IntValue);
+    }
+
+    [Fact]
+    public void FormulaParse_MultiplicationPrecedence()
+    {
+        var formula = "=123+456*789";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<BinaryExpressionSyntaxNode>(node);
+        var binaryNode = (BinaryExpressionSyntaxNode)node;
+        Assert.Equal(BinaryOperator.Plus, binaryNode.Operator);
+        Assert.IsType<NumberLiteralSyntaxNode>(binaryNode.Left);
+        Assert.IsType<BinaryExpressionSyntaxNode>(binaryNode.Right);
+        var rightBinaryNode = (BinaryExpressionSyntaxNode)binaryNode.Right;
+        Assert.Equal(BinaryOperator.Multiply, rightBinaryNode.Operator);
+        Assert.Equal(456, ((NumberLiteralSyntaxNode)rightBinaryNode.Left).Token.IntValue);
+        Assert.Equal(789, ((NumberLiteralSyntaxNode)rightBinaryNode.Right).Token.IntValue);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseDivisionOfTwoNumberLiterals()
+    {
+        var formula = "=123/456";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<BinaryExpressionSyntaxNode>(node);
+        var binaryNode = (BinaryExpressionSyntaxNode)node;
+        Assert.Equal(BinaryOperator.Divide, binaryNode.Operator);
+        Assert.IsType<NumberLiteralSyntaxNode>(binaryNode.Left);
+        Assert.IsType<NumberLiteralSyntaxNode>(binaryNode.Right);
+        Assert.Equal(123, ((NumberLiteralSyntaxNode)binaryNode.Left).Token.IntValue);
+        Assert.Equal(456, ((NumberLiteralSyntaxNode)binaryNode.Right).Token.IntValue);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseParentheses()
+    {
+        var formula = "=(123+456)*789";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<BinaryExpressionSyntaxNode>(node);
+        var binaryNode = (BinaryExpressionSyntaxNode)node;
+        Assert.Equal(BinaryOperator.Multiply, binaryNode.Operator);
+        Assert.IsType<BinaryExpressionSyntaxNode>(binaryNode.Left);
+        Assert.IsType<NumberLiteralSyntaxNode>(binaryNode.Right);
+        var leftBinaryNode = (BinaryExpressionSyntaxNode)binaryNode.Left;
+        Assert.Equal(789, ((NumberLiteralSyntaxNode)binaryNode.Right).Token.IntValue);
+        Assert.Equal(BinaryOperator.Plus, leftBinaryNode.Operator);
+        Assert.Equal(123, ((NumberLiteralSyntaxNode)leftBinaryNode.Left).Token.IntValue);
+        Assert.Equal(456, ((NumberLiteralSyntaxNode)leftBinaryNode.Right).Token.IntValue);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseNestedParentheses()
+    {
+        var formula = "=((123+456)*789)/101112";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<BinaryExpressionSyntaxNode>(node);
+        var binaryNode = (BinaryExpressionSyntaxNode)node;
+        Assert.Equal(BinaryOperator.Divide, binaryNode.Operator);
+        Assert.IsType<BinaryExpressionSyntaxNode>(binaryNode.Left);
+        Assert.IsType<NumberLiteralSyntaxNode>(binaryNode.Right);
+        var leftBinaryNode = (BinaryExpressionSyntaxNode)binaryNode.Left;
+        Assert.Equal(101112, ((NumberLiteralSyntaxNode)binaryNode.Right).Token.IntValue);
+        Assert.Equal(BinaryOperator.Multiply, leftBinaryNode.Operator);
+        Assert.IsType<BinaryExpressionSyntaxNode>(leftBinaryNode.Left);
+        var leftLeftBinaryNode = (BinaryExpressionSyntaxNode)leftBinaryNode.Left;
+        Assert.Equal(123, ((NumberLiteralSyntaxNode)leftLeftBinaryNode.Left).Token.IntValue);
+        Assert.Equal(456, ((NumberLiteralSyntaxNode)leftLeftBinaryNode.Right).Token.IntValue);
+        Assert.Equal(789, ((NumberLiteralSyntaxNode)leftBinaryNode.Right).Token.IntValue);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseCellIndentifer()
+    {
+        var formula = "=A1";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<CellSyntaxNode>(node);
+        var cellIdentifierNode = (CellSyntaxNode)node;
+        Assert.Equal("A1", cellIdentifierNode.Token.Address.ToString());
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseSheetQualifiedCellIdentifier()
+    {
+        var formula = "=Sheet2!C1";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<CellSyntaxNode>(node);
+        var cellIdentifierNode = (CellSyntaxNode)node;
+        Assert.Equal("C1", cellIdentifierNode.Token.Address.ToString());
+        Assert.Equal("Sheet2", cellIdentifierNode.Token.Address.Sheet);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseFunction()
+    {
+        var formula = "=SUM(A1,1)";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<FunctionSyntaxNode>(node);
+        var functionNode = (FunctionSyntaxNode)node;
+        Assert.Equal("SUM", functionNode.Name);
+        Assert.Equal(2, functionNode.Arguments.Count);
+        Assert.IsType<CellSyntaxNode>(functionNode.Arguments[0]);
+        Assert.IsType<NumberLiteralSyntaxNode>(functionNode.Arguments[1]);
+
+        var cellIdentifierNode = (CellSyntaxNode)functionNode.Arguments[0];
+        Assert.Equal("A1", cellIdentifierNode.Token.Address.ToString());
+        var numberLiteralNode = (NumberLiteralSyntaxNode)functionNode.Arguments[1];
+        Assert.Equal(1, numberLiteralNode.Token.IntValue);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseNestedFunctions()
+    {
+        var formula = "=SUM(A1,MAX(B1,C1))";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<FunctionSyntaxNode>(node);
+        var functionNode = (FunctionSyntaxNode)node;
+        Assert.Equal("SUM", functionNode.Name);
+        Assert.Equal(2, functionNode.Arguments.Count);
+        Assert.IsType<CellSyntaxNode>(functionNode.Arguments[0]);
+        Assert.IsType<FunctionSyntaxNode>(functionNode.Arguments[1]);
+
+        var cellIdentifierNode = (CellSyntaxNode)functionNode.Arguments[0];
+        Assert.Equal("A1", cellIdentifierNode.Token.Address.ToString());
+
+        var nestedFunctionNode = (FunctionSyntaxNode)functionNode.Arguments[1];
+        Assert.Equal("MAX", nestedFunctionNode.Name);
+        Assert.Equal(2, nestedFunctionNode.Arguments.Count);
+        Assert.IsType<CellSyntaxNode>(nestedFunctionNode.Arguments[0]);
+        Assert.IsType<CellSyntaxNode>(nestedFunctionNode.Arguments[1]);
+
+        var firstCellIdentifierNode = (CellSyntaxNode)nestedFunctionNode.Arguments[0];
+        var secondCellIdentifierNode = (CellSyntaxNode)nestedFunctionNode.Arguments[1];
+        Assert.Equal("B1", firstCellIdentifierNode.Token.Address.ToString());
+        Assert.Equal("C1", secondCellIdentifierNode.Token.Address.ToString());
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseFunctionWithNoArguments()
+    {
+        var formula = "=SUM()";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<FunctionSyntaxNode>(node);
+        var functionNode = (FunctionSyntaxNode)node;
+        Assert.Equal("SUM", functionNode.Name);
+        Assert.Empty(functionNode.Arguments);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseCellRange()
+    {
+        var formula = "=A1:A2";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<RangeSyntaxNode>(node);
+        var rangeNode = (RangeSyntaxNode)node;
+        Assert.Equal("A1", rangeNode.Start.Token.Address.ToString());
+        Assert.Equal("A2", rangeNode.End.Token.Address.ToString());
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseSheetQualifiedRange()
+    {
+        var formula = "=Sheet2!A1:Sheet2!B2";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<RangeSyntaxNode>(node);
+        var rangeNode = (RangeSyntaxNode)node;
+        Assert.Equal("A1", rangeNode.Start.Token.Address.ToString());
+        Assert.Equal("B2", rangeNode.End.Token.Address.ToString());
+        Assert.Equal("Sheet2", rangeNode.Start.Token.Address.Sheet);
+        Assert.Equal("Sheet2", rangeNode.End.Token.Address.Sheet);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseCellRangeInFunction()
+    {
+        var formula = "=SUM(A1:A2)";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<FunctionSyntaxNode>(node);
+        var functionNode = (FunctionSyntaxNode)node;
+        Assert.Equal("SUM", functionNode.Name);
+        Assert.Single(functionNode.Arguments);
+        Assert.IsType<RangeSyntaxNode>(functionNode.Arguments[0]);
+        var rangeNode = (RangeSyntaxNode)functionNode.Arguments[0];
+        Assert.Equal("A1", rangeNode.Start.Token.Address.ToString());
+        Assert.Equal("A2", rangeNode.End.Token.Address.ToString());
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldHandleInvalidRange()
+    {
+        var formula = "=A2:A1";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<RangeSyntaxNode>(node);
+        var rangeNode = (RangeSyntaxNode)node;
+        Assert.Equal("A2", rangeNode.Start.Token.Address.ToString());
+        Assert.Equal("A1", rangeNode.End.Token.Address.ToString());
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldHandleSingleCellRange()
+    {
+        var formula = "=A1:A1";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<RangeSyntaxNode>(node);
+        var rangeNode = (RangeSyntaxNode)node;
+        Assert.Equal("A1", rangeNode.Start.Token.Address.ToString());
+        Assert.Equal("A1", rangeNode.End.Token.Address.ToString());
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldHandleMultiColumnRange()
+    {
+        var formula = "=A1:B1";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<RangeSyntaxNode>(node);
+        var rangeNode = (RangeSyntaxNode)node;
+        Assert.Equal("A1", rangeNode.Start.Token.Address.ToString());
+        Assert.Equal("B1", rangeNode.End.Token.Address.ToString());
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldHandleMultiRowRange()
+    {
+        var formula = "=A1:A2";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<RangeSyntaxNode>(node);
+        var rangeNode = (RangeSyntaxNode)node;
+        Assert.Equal("A1", rangeNode.Start.Token.Address.ToString());
+        Assert.Equal("A2", rangeNode.End.Token.Address.ToString());
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldHandleMultiCellRange()
+    {
+        var formula = "=A1:B2";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.IsType<RangeSyntaxNode>(node);
+        var rangeNode = (RangeSyntaxNode)node;
+        Assert.Equal("A1", rangeNode.Start.Token.Address.ToString());
+        Assert.Equal("B2", rangeNode.End.Token.Address.ToString());
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldAddErrorOnInvalidFormula()
+    {
+        var formula = "A1"; // Missing equals sign
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.NotEmpty(syntaxTree.Errors);
+        Assert.Contains("Unexpected token", syntaxTree.Errors[0]);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldReturnPartialExpressionOnIncompleteExpression()
+    {
+        var formula = "=123+"; // Incomplete expression
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.NotEmpty(syntaxTree.Errors);
+        Assert.IsType<BinaryExpressionSyntaxNode>(syntaxTree.Root);
+        if (syntaxTree.Root is BinaryExpressionSyntaxNode binaryNode)
+        {
+            Assert.Equal(BinaryOperator.Plus, binaryNode.Operator);
+            Assert.IsType<NumberLiteralSyntaxNode>(binaryNode.Left);
+            Assert.Equal(123, ((NumberLiteralSyntaxNode)binaryNode.Left).Token.IntValue);
+        }
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldAddErrorOnIncompleteExpression()
+    {
+        var formula = "=123+"; // Incomplete expression
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.NotEmpty(syntaxTree.Errors);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldReturnPartialFunctionOnMissingCloseParen()
+    {
+        var formula = "=SUM(A1"; // Missing closing parenthesis
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.NotEmpty(syntaxTree.Errors);
+        Assert.IsType<FunctionSyntaxNode>(syntaxTree.Root);
+        var functionNode = (FunctionSyntaxNode)syntaxTree.Root;
+        Assert.Equal("SUM", functionNode.Name);
+        Assert.Single(functionNode.Arguments);
+        Assert.IsType<CellSyntaxNode>(functionNode.Arguments[0]);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldAddErrorOnInvalidFunctionSyntax()
+    {
+        var formula = "=SUM(A1"; // Missing closing parenthesis
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.NotEmpty(syntaxTree.Errors);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseGroupedExpression()
+    {
+        var formula = "=(A1)"; // Parentheses without function name should parse as grouped expression
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors); // This should actually succeed as it's a valid grouped expression
+        Assert.IsType<CellSyntaxNode>(syntaxTree.Root);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldReturnPartialRangeOnIncompleteRange()
+    {
+        var formula = "=A1:"; // Incomplete range
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.NotEmpty(syntaxTree.Errors);
+        Assert.NotNull(syntaxTree.Root);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldAddErrorOnInvalidRange()
+    {
+        var formula = "=A1:"; // Incomplete range
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.NotEmpty(syntaxTree.Errors);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldHandleUnterminatedString()
+    {
+        var formula = "=\"hello"; // Unterminated string literal
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors); // Should succeed as lexer handles unterminated strings
+        Assert.IsType<StringLiteralSyntaxNode>(syntaxTree.Root);
+        var stringNode = (StringLiteralSyntaxNode)syntaxTree.Root;
+        Assert.Equal("hello", stringNode.Token.Value);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldHandleMissingOperand()
+    {
+        var formula = "=*5"; // Missing left operand
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.NotEmpty(syntaxTree.Errors); // Should have errors
+        Assert.NotNull(syntaxTree.Root);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldReturnPartialExpressionOnUnbalancedParentheses()
+    {
+        var formula = "=(A1+B1"; // Missing closing parenthesis
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.NotEmpty(syntaxTree.Errors);
+        Assert.IsType<BinaryExpressionSyntaxNode>(syntaxTree.Root); // Should return the binary expression inside
+        var binaryNode = (BinaryExpressionSyntaxNode)syntaxTree.Root;
+        Assert.Equal(BinaryOperator.Plus, binaryNode.Operator);
+        Assert.IsType<CellSyntaxNode>(binaryNode.Left);
+        Assert.IsType<CellSyntaxNode>(binaryNode.Right);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldAddErrorOnUnbalancedParentheses()
+    {
+        var formula = "=(A1+B1"; // Missing closing parenthesis
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.NotEmpty(syntaxTree.Errors);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldReturnPartialFunctionOnIncompleteArguments()
+    {
+        var formula = "=SUM(A1,"; // Incomplete function arguments
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.NotEmpty(syntaxTree.Errors);
+        Assert.IsType<FunctionSyntaxNode>(syntaxTree.Root);
+        var functionNode = (FunctionSyntaxNode)syntaxTree.Root;
+        Assert.Equal("SUM", functionNode.Name);
+        Assert.True(functionNode.Arguments.Count >= 1); // Should have at least the first argument
+        Assert.IsType<CellSyntaxNode>(functionNode.Arguments[0]);
+    }
+
+    [Fact]
+    public void FormulaParser_DefaultBehavior_ShouldStillWork()
+    {
+        // Test that default behavior still works as before
+        var formula = "=123+456";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var node = syntaxTree.Root;
+        Assert.NotNull(node);
+        Assert.IsType<BinaryExpressionSyntaxNode>(node);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseBooleanTrue()
+    {
+        var formula = "=TRUE";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        Assert.IsType<BooleanLiteralSyntaxNode>(syntaxTree.Root);
+        var boolNode = (BooleanLiteralSyntaxNode)syntaxTree.Root;
+        Assert.Equal("TRUE", boolNode.Token.Value);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseBooleanFalse_Lowercase()
+    {
+        var formula = "=false";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        Assert.IsType<BooleanLiteralSyntaxNode>(syntaxTree.Root);
+        var boolNode = (BooleanLiteralSyntaxNode)syntaxTree.Root;
+        Assert.Equal("false", boolNode.Token.Value);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParseBooleanInFunction()
+    {
+        var formula = "=TEXTJOIN(\", \", TRUE, A1:A2)";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.Empty(syntaxTree.Errors);
+        var fn = Assert.IsType<FunctionSyntaxNode>(syntaxTree.Root);
+        Assert.Equal("TEXTJOIN", fn.Name);
+        Assert.IsType<BooleanLiteralSyntaxNode>(fn.Arguments[1]);
+    }
+
+    [Fact]
+    public void FormulaParser_ShouldParse_Percent()
+    {
+        var formula = "=$%";
+        var syntaxTree = FormulaParser.Parse(formula);
+        Assert.NotEmpty(syntaxTree.Errors);
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/FunctionRegistryTests.cs

@@ -0,0 +1,74 @@
+using System;
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class FunctionRegistryTests
+{
+    private readonly FunctionStore functionRegistry = new();
+
+    [Theory]
+    [InlineData(2, -1)]
+    [InlineData(4, -1)]
+    [InlineData(5, 0)]
+    [InlineData(6, 0)]
+    [InlineData(7, 1)]
+    [InlineData(8, 1)]
+    [InlineData(9, 2)]
+    [InlineData(10, 2)]
+    public void Basic_Function_Provides_Correct_Arg_Index(int cursorPosition, int expectedArgIndex)
+    {
+        var func = "=SUM(1,2,3)";
+        var result = functionRegistry.CreateFunctionHint(func, cursorPosition);
+
+        Assert.NotNull(result);
+
+        Assert.Equal(expectedArgIndex, result.ArgumentIndex);
+        Assert.IsType<SumFunction>(result.Function);
+    }
+    [Theory]
+    [InlineData(5, 0, "=SUM(")]
+    [InlineData(4, -1, "=SUM(")]
+    public void Basic_Function_Provides_Correct_Arg_Index_With_IncompleteFormula(int cursorPosition, int expectedArgIndex, string formula)
+    {
+        var result = functionRegistry.CreateFunctionHint(formula, cursorPosition);
+
+        Assert.NotNull(result);
+
+        Assert.Equal(expectedArgIndex, result.ArgumentIndex);
+        Assert.IsType<SumFunction>(result.Function);
+    }
+
+    [Fact]
+    public void Position_Outside_Of_Formula_Returns_null()
+    {
+        var func = "=1 + SUM(1,2, 3) + 2";
+        var result = functionRegistry.CreateFunctionHint(func, 0);
+
+        Assert.Null(result);
+
+        result = functionRegistry.CreateFunctionHint(func, 5);
+        Assert.Null(result);
+
+        result = functionRegistry.CreateFunctionHint(func, 16);
+        Assert.Null(result);
+    }
+
+    [Theory]
+    [InlineData(5, 0, typeof(SumFunction))]
+    [InlineData(7, 1, typeof(SumFunction))]
+    [InlineData(8, -1, typeof(CountFunction))]
+    [InlineData(13, 0, typeof(CountFunction))]
+    [InlineData(15, 1, typeof(CountFunction))]
+    [InlineData(17, 1, typeof(SumFunction))]
+    public void Nested_Function_Produces_Correct_ArgIndex(int cursorPosition, int expectedArgIndex, Type expectedFunction)
+    {
+        var func = "=SUM(1,COUNT(1,2),3)";
+        var result = functionRegistry.CreateFunctionHint(func, cursorPosition);
+
+        Assert.NotNull(result);
+
+        Assert.Equal(expectedArgIndex, result.ArgumentIndex);
+        Assert.IsType(expectedFunction, result.Function);
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/HorizontalLookupFunctionTests.cs

@@ -0,0 +1,59 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class HorizontalLookupFunctionTests
+{
+    readonly Sheet sheet = new(10, 10);
+
+    [Fact]
+    public void ShouldFindExactMatchInTwoRowRange()
+    {
+        sheet.Cells["A1"].Value = "Size";
+        sheet.Cells["B1"].Value = "Color";
+        sheet.Cells["A2"].Value = "M";
+        sheet.Cells["B2"].Value = "Blue";
+
+        sheet.Cells["C1"].Formula = "=HLOOKUP(\"Color\",A1:B2,2,0)";
+
+        Assert.Equal("Blue", sheet.Cells["C1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnNAWhenNoExactMatch()
+    {
+        sheet.Cells["A1"].Value = "Size";
+        sheet.Cells["A2"].Value = "M";
+
+        sheet.Cells["B1"].Formula = "=HLOOKUP(\"Color\",A1:A2,2,0)";
+
+        Assert.Equal(CellError.NA, sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldFindApproximateMatchInSortedTopRow()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["B1"].Value = 20;
+        sheet.Cells["C1"].Value = 30;
+
+        sheet.Cells["A2"].Value = "Low";
+        sheet.Cells["B2"].Value = "Medium";
+        sheet.Cells["C2"].Value = "High";
+
+        sheet.Cells["D1"].Formula = "=HLOOKUP(25,A1:C2,2,1)";
+
+        Assert.Equal("Medium", sheet.Cells["D1"].Value);
+    }
+
+    [Fact]
+    public void ShouldErrorWhenIndexOutOfRange()
+    {
+        sheet.Cells["A1"].Value = "X";
+        sheet.Cells["A2"].Value = 1;
+
+        sheet.Cells["B1"].Formula = "=HLOOKUP(\"X\",A1:A2,3,0)";
+
+        Assert.Equal(CellError.Ref, sheet.Cells["B1"].Value);
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/HourFunctionTests.cs

@@ -0,0 +1,33 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class HourFunctionTests
+{
+    [Fact]
+    public void Hour_FromFraction_Returns18()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A2"].Data = CellData.FromNumber(0.75); // 18:00
+        sheet.Cells["B2"].Formula = "=HOUR(A2)";
+        Assert.Equal(18, sheet.Cells["B2"].Data.GetValueOrDefault<double>());
+    }
+
+    [Fact]
+    public void Hour_FromDateTimeValue_ReturnsHour()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A3"].Data = CellData.FromDate(new System.DateTime(2011, 7, 18, 7, 45, 0));
+        sheet.Cells["B3"].Formula = "=HOUR(A3)";
+        Assert.Equal(7, sheet.Cells["B3"].Data.GetValueOrDefault<double>());
+    }
+
+    [Fact]
+    public void Hour_FromDateOnly_ReturnsZero()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A4"].Data = CellData.FromDate(new System.DateTime(2012, 4, 21));
+        sheet.Cells["B4"].Formula = "=HOUR(A4)";
+        Assert.Equal(0, sheet.Cells["B4"].Data.GetValueOrDefault<double>());
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/IfErrorFunctionTests.cs

@@ -0,0 +1,138 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class IfErrorFunctionTests
+{
+    readonly Sheet sheet = new(5, 5);
+
+    [Fact]
+    public void ShouldEvaluateIfErrorFunctionWithNoError()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 2;
+        sheet.Cells["A3"].Formula = "=IFERROR(A1/A2, \"Error in calculation\")";
+
+        Assert.Equal(5d, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfErrorFunctionWithDivisionByZero()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 0;
+        sheet.Cells["A3"].Formula = "=IFERROR(A1/A2, \"Error in calculation\")";
+
+        Assert.Equal("Error in calculation", sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfErrorFunctionWithReferenceError()
+    {
+        sheet.Cells["A1"].Formula = "=IFERROR(A6, \"Error in calculation\")";
+
+        Assert.Equal("Error in calculation", sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfErrorFunctionWithEmptyStringForError()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 0;
+        sheet.Cells["A3"].Formula = "=IFERROR(A1/A2, \"\")";
+
+        Assert.Equal("", sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfErrorFunctionWithNumericErrorValue()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 0;
+        sheet.Cells["A3"].Formula = "=IFERROR(A1/A2, 0)";
+
+        Assert.Equal(0d, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfErrorFunctionWithEmptyCellAsErrorValue()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 0;
+        sheet.Cells["A3"].Formula = "=IFERROR(A1/A2, A4)";
+
+        Assert.Equal("", sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfErrorFunctionWithEmptyCellAsValue()
+    {
+        sheet.Cells["A1"].Formula = "=IFERROR(A2, \"Empty cell\")";
+
+        Assert.Equal("", sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfErrorFunctionWithStringValue()
+    {
+        sheet.Cells["A1"].Value = "Hello";
+        sheet.Cells["A2"].Formula = "=IFERROR(A1, \"Error\")";
+
+        Assert.Equal("Hello", sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfErrorFunctionWithBooleanValue()
+    {
+        sheet.Cells["A1"].Value = true;
+        sheet.Cells["A2"].Formula = "=IFERROR(A1, \"Error\")";
+
+        Assert.Equal(true, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnValueErrorForIfErrorTooFewArguments()
+    {
+        sheet.Cells["A1"].Formula = "=IFERROR(A2)";
+
+        Assert.Equal(CellError.Value, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnValueErrorForIfErrorTooManyArguments()
+    {
+        sheet.Cells["A1"].Formula = "=IFERROR(A2, \"Error\", \"Extra\")";
+
+        Assert.Equal(CellError.Value, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfErrorFunctionWithNestedFormula()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 0;
+        sheet.Cells["A3"].Formula = "=IFERROR(A1/A2, IFERROR(A1/0, \"Nested Error\"))";
+
+        Assert.Equal("Nested Error", sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfErrorFunctionWithSumFunction()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 20;
+        sheet.Cells["A3"].Formula = "=IFERROR(SUM(A1:A2), \"Error\")";
+
+        Assert.Equal(30d, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfErrorFunctionWithSumFunctionError()
+    {
+        sheet.Cells["A1"].Formula = "=IFERROR(SUM(A6:A8), \"Error\")";
+
+        Assert.Equal("Error", sheet.Cells["A1"].Value);
+    }
+}
+
+

Radzen.Blazor.Tests/Spreadsheet/IfFunctionTests.cs

@@ -0,0 +1,178 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class IfFunctionTests
+{
+    readonly Sheet sheet = new(5, 5);
+
+    [Fact]
+    public void ShouldEvaluateIfFunctionWithTrueCondition()
+    {
+        sheet.Cells["A1"].Value = 1;
+        sheet.Cells["A2"].Formula = "=IF(A1=1,\"Yes\",\"No\")";
+
+        Assert.Equal("Yes", sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfFunctionWithFalseCondition()
+    {
+        sheet.Cells["A1"].Value = 2;
+        sheet.Cells["A2"].Formula = "=IF(A1=1,\"Yes\",\"No\")";
+
+        Assert.Equal("No", sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfFunctionWithNumericComparison()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 5;
+        sheet.Cells["A3"].Formula = "=IF(A1>A2,\"Over Budget\",\"Within Budget\")";
+
+        Assert.Equal("Over Budget", sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfFunctionWithNumericResult()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 5;
+        sheet.Cells["A3"].Formula = "=IF(A1>A2,A1-A2,0)";
+
+        Assert.Equal(5d, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfFunctionWithTwoArguments()
+    {
+        sheet.Cells["A1"].Value = 1;
+        sheet.Cells["A2"].Formula = "=IF(A1=1,\"True\")";
+
+        Assert.Equal("True", sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfFunctionWithTwoArgumentsFalseCondition()
+    {
+        sheet.Cells["A1"].Value = 0;
+        sheet.Cells["A2"].Formula = "=IF(A1=1,\"True\")";
+
+        Assert.Equal(false, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfFunctionWithZeroAsFalse()
+    {
+        sheet.Cells["A1"].Value = 0;
+        sheet.Cells["A2"].Formula = "=IF(A1,\"True\",\"False\")";
+
+        Assert.Equal("False", sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfFunctionWithNonZeroAsTrue()
+    {
+        sheet.Cells["A1"].Value = 5;
+        sheet.Cells["A2"].Formula = "=IF(A1,\"True\",\"False\")";
+
+        Assert.Equal("True", sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateToErrorIfFunctionWithStringCondition()
+    {
+        sheet.Cells["A1"].Value = "test";
+        sheet.Cells["A2"].Formula = "=IF(A1,\"Not Empty\",\"Empty\")";
+
+        Assert.Equal(CellError.Value, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfFunctionWithEmptyStringCondition()
+    {
+        sheet.Cells["A2"].Formula = "=IF(A1,\"Not Empty\",\"Empty\")";
+
+        Assert.Equal("Empty", sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfFunctionWithNullCondition()
+    {
+        sheet.Cells["A2"].Formula = "=IF(A1,\"Not Empty\",\"Empty\")";
+
+        Assert.Equal("Empty", sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnValueErrorForTooFewArguments()
+    {
+        sheet.Cells["A1"].Formula = "=IF(A2)";
+
+        Assert.Equal(CellError.Value, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnValueErrorForTooManyArguments()
+    {
+        sheet.Cells["A1"].Formula = "=IF(A2,\"True\",\"False\",\"Extra\")";
+
+        Assert.Equal(CellError.Value, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldPropagateErrorFromCondition()
+    {
+        sheet.Cells["A1"].Formula = "=IF(A6,\"True\",\"False\")";
+
+        Assert.Equal(CellError.Ref, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldPropagateErrorFromTrueValue()
+    {
+        sheet.Cells["A1"].Value = 1;
+        sheet.Cells["A2"].Formula = "=IF(A1=1,A6,\"False\")";
+
+        Assert.Equal(CellError.Ref, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldPropagateErrorFromFalseValue()
+    {
+        sheet.Cells["A1"].Value = 0;
+        sheet.Cells["A2"].Formula = "=IF(A1=1,\"True\",A6)";
+
+        Assert.Equal(CellError.Ref, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNestedIfFunction()
+    {
+        sheet.Cells["A1"].Value = 85;
+        sheet.Cells["A2"].Formula = "=IF(A1>=90,\"A\",IF(A1>=80,\"B\",IF(A1>=70,\"C\",\"F\")))";
+
+        Assert.Equal("B", sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfFunctionWithBooleanValues()
+    {
+        sheet.Cells["A1"].Value = true;
+        sheet.Cells["A2"].Formula = "=IF(A1,\"True\",\"False\")";
+
+        Assert.Equal("True", sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateIfFunctionWithDecimalValues()
+    {
+        sheet.Cells["A1"].Value = 0.5m;
+        sheet.Cells["A2"].Formula = "=IF(A1,\"True\",\"False\")";
+
+        Assert.Equal("True", sheet.Cells["A2"].Value);
+    }
+}
+
+

Radzen.Blazor.Tests/Spreadsheet/IndexFunctionTests.cs

@@ -0,0 +1,100 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class IndexFunctionTests
+{
+    readonly Sheet sheet = new(10, 10);
+
+    void Seed()
+    {
+        sheet.Cells["A2"].Value = "Apples";
+        sheet.Cells["B2"].Value = "Lemons";
+        sheet.Cells["A3"].Value = "Bananas";
+        sheet.Cells["B3"].Value = "Pears";
+    }
+
+    [Fact]
+    public void ShouldReturnIntersectionValue()
+    {
+        Seed();
+
+        sheet.Cells["C1"].Formula = "=INDEX(A2:B3,2,2)";
+        Assert.Equal("Pears", sheet.Cells["C1"].Value);
+
+        sheet.Cells["C2"].Formula = "=INDEX(A2:B3,2,1)";
+        Assert.Equal("Bananas", sheet.Cells["C2"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnRefErrorIfOutOfRange()
+    {
+        // numeric values just to ensure range exists
+        sheet.Cells["A1"].Value = 1;
+        sheet.Cells["B1"].Value = 2;
+        sheet.Cells["A2"].Value = 3;
+        sheet.Cells["B2"].Value = 4;
+
+        sheet.Cells["C1"].Formula = "=INDEX(A1:B2,3,1)"; // row 3 out of 2 rows
+        Assert.Equal(CellError.Ref, sheet.Cells["C1"].Value);
+    }
+
+    [Fact]
+    public void ShouldDefaultColumnToFirstWhenOmitted()
+    {
+        Seed();
+        sheet.Cells["C1"].Formula = "=INDEX(A2:B3,2)"; // column omitted -> first column
+        Assert.Equal("Bananas", sheet.Cells["C1"].Value);
+    }
+
+    [Fact]
+    public void ShouldUseAreaOneWhenSpecified()
+    {
+        Seed();
+        sheet.Cells["C1"].Formula = "=INDEX(A2:B3,2,2,1)";
+        Assert.Equal("Pears", sheet.Cells["C1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnValueErrorWhenAreaGreaterThanOne()
+    {
+        Seed();
+        sheet.Cells["C1"].Formula = "=INDEX(A2:B3,1,1,2)";
+        Assert.Equal(CellError.Value, sheet.Cells["C1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnFirstOfEntireColumnWhenRowIsZero()
+    {
+        Seed();
+        sheet.Cells["C1"].Formula = "=INDEX(A2:B3,0,2)";
+        Assert.Equal("Lemons", sheet.Cells["C1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnFirstOfEntireRowWhenColumnIsZero()
+    {
+        Seed();
+        sheet.Cells["C1"].Formula = "=INDEX(A2:B3,2,0)";
+        Assert.Equal("Bananas", sheet.Cells["C1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnValueErrorWhenBothRowAndColumnOmitted()
+    {
+        Seed();
+        sheet.Cells["C1"].Formula = "=INDEX(A2:B3)";
+        Assert.Equal(CellError.Value, sheet.Cells["C1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnRefErrorOnNegativeIndices()
+    {
+        Seed();
+        sheet.Cells["C1"].Formula = "=INDEX(A2:B3,0-1,1)"; // -1
+        Assert.Equal(CellError.Ref, sheet.Cells["C1"].Value);
+
+        sheet.Cells["C2"].Formula = "=INDEX(A2:B3,1,0-1)"; // -1
+        Assert.Equal(CellError.Ref, sheet.Cells["C2"].Value);
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/InsertRowColumnTests.cs

@@ -0,0 +1,64 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class InsertRowColumnTests
+{
+    [Fact]
+    public void InsertColumn_ShiftsReferencesAndValues()
+    {
+        var sheet = new Sheet(5, 5);
+
+        sheet.Cells[1, 0].Value = 1;   // A2
+        sheet.Cells[1, 1].Formula = "=A2+10"; // B2
+        Assert.Equal(11d, sheet.Cells[1, 1].Value);
+
+        // Insert a column before A (index 0)
+        sheet.InsertColumn(0, 1);
+
+        // Values shift right
+        Assert.Equal(1d, sheet.Cells[1, 1].Value); // A2 moved to B2
+
+        // Formula shifts position and updates referenced address
+        Assert.Equal("=B2+10", sheet.Cells[1, 2].Formula); // original B2 moved to C2
+        Assert.Equal(11d, sheet.Cells[1, 2].Value);
+    }
+
+    [Fact]
+    public void InsertRow_ShiftsReferencesAndValues()
+    {
+        var sheet = new Sheet(5, 5);
+
+        sheet.Cells[1, 0].Value = 1;   // A2
+        sheet.Cells[1, 1].Formula = "=A2+10"; // B2
+        Assert.Equal(11d, sheet.Cells[1, 1].Value);
+
+        // Insert a row before row 2 (index 1)
+        sheet.InsertRow(1, 1);
+
+        // Values shift down
+        Assert.Equal(1d, sheet.Cells[2, 0].Value); // A2 moved to A3
+
+        // Formula shifts position and updates referenced address
+        Assert.Equal("=A3+10", sheet.Cells[2, 1].Formula); // original B2 moved to B3
+        Assert.Equal(11d, sheet.Cells[2, 1].Value);
+    }
+
+    [Fact]
+    public void InsertRow_IncreasesRowCount()
+    {
+        var sheet = new Sheet(5, 5);
+        sheet.InsertRow(2, 2);
+        Assert.Equal(7, sheet.RowCount);
+    }
+
+    [Fact]
+    public void InsertColumn_IncreasesColumnCount()
+    {
+        var sheet = new Sheet(5, 5);
+        sheet.InsertColumn(3, 3);
+        Assert.Equal(8, sheet.ColumnCount);
+    }
+}
+
+

Radzen.Blazor.Tests/Spreadsheet/IntFunctionTests.cs

@@ -0,0 +1,30 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class IntFunctionTests
+{
+    readonly Sheet sheet = new(10, 10);
+
+    [Fact]
+    public void ShouldRoundDownPositive()
+    {
+        sheet.Cells["A1"].Formula = "=INT(8.9)";
+        Assert.Equal(8d, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldRoundDownNegative()
+    {
+        sheet.Cells["A1"].Formula = "=INT(0-8.9)";
+        Assert.Equal(-9d, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnDecimalPart()
+    {
+        sheet.Cells["A2"].Value = 19.5;
+        sheet.Cells["A1"].Formula = "=A2-INT(A2)";
+        Assert.Equal(0.5, sheet.Cells["A1"].Value);
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/LargeFunctionTests.cs

@@ -0,0 +1,74 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class LargeFunctionTests
+{
+    readonly Sheet sheet = new(10, 10);
+
+    [Fact]
+    public void ShouldReturnKthLargestAcrossRange()
+    {
+        // Populate A2:B6 as in example
+        sheet.Cells["A2"].Value = 3;
+        sheet.Cells["A3"].Value = 4;
+        sheet.Cells["A4"].Value = 5;
+        sheet.Cells["A5"].Value = 2;
+        sheet.Cells["A6"].Value = 3;
+
+        sheet.Cells["B2"].Value = 4;
+        sheet.Cells["B3"].Value = 5;
+        sheet.Cells["B4"].Value = 6;
+        sheet.Cells["B5"].Value = 4;
+        sheet.Cells["B6"].Value = 7;
+
+        sheet.Cells["C1"].Formula = "=LARGE(A2:B6,3)";
+
+        Assert.Equal(5d, sheet.Cells["C1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturn7thLargestAsFour()
+    {
+        sheet.Cells["A2"].Value = 3;
+        sheet.Cells["A3"].Value = 4;
+        sheet.Cells["A4"].Value = 5;
+        sheet.Cells["A5"].Value = 2;
+        sheet.Cells["A6"].Value = 3;
+
+        sheet.Cells["B2"].Value = 4;
+        sheet.Cells["B3"].Value = 5;
+        sheet.Cells["B4"].Value = 6;
+        sheet.Cells["B5"].Value = 4;
+        sheet.Cells["B6"].Value = 7;
+
+        sheet.Cells["C1"].Formula = "=LARGE(A2:B6,7)";
+
+        Assert.Equal(4d, sheet.Cells["C1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnNumErrorForInvalidK()
+    {
+        sheet.Cells["A1"].Value = 1;
+        sheet.Cells["A2"].Value = 2;
+        sheet.Cells["A3"].Value = 3;
+
+        sheet.Cells["B1"].Formula = "=LARGE(A1:A3,0)";
+        Assert.Equal(CellError.Num, sheet.Cells["B1"].Value);
+
+        sheet.Cells["B2"].Formula = "=LARGE(A1:A3,5)";
+        Assert.Equal(CellError.Num, sheet.Cells["B2"].Value);
+    }
+
+    [Fact]
+    public void ShouldIgnoreNonNumericCellsInArray()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = "x"; // ignored
+        sheet.Cells["A3"].Value = 7;
+
+        sheet.Cells["B1"].Formula = "=LARGE(A1:A3,2)";
+        Assert.Equal(7d, sheet.Cells["B1"].Value);
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/LeftFunctionTests.cs

@@ -0,0 +1,42 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class LeftFunctionTests
+{
+    [Fact]
+    public void Left_WithCount_ReturnsPrefix()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A2"].Value = "Sale Price";
+        sheet.Cells["B1"].Formula = "=LEFT(A2,4)";
+        Assert.Equal("Sale", sheet.Cells["B1"].Data.Value);
+    }
+
+    [Fact]
+    public void Left_OmittedCount_DefaultsToOne()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A3"].Value = "Sweden";
+        sheet.Cells["B1"].Formula = "=LEFT(A3)";
+        Assert.Equal("S", sheet.Cells["B1"].Data.Value);
+    }
+
+    [Fact]
+    public void Left_CountExceedsLength_ReturnsWhole()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A1"].Value = "Hi";
+        sheet.Cells["B1"].Formula = "=LEFT(A1,5)";
+        Assert.Equal("Hi", sheet.Cells["B1"].Data.Value);
+    }
+
+    [Fact]
+    public void Left_NegativeCount_ReturnsValueError()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A1"].Value = "Test";
+        sheet.Cells["B1"].Formula = "=LEFT(A1,-1)";
+        Assert.Equal(CellError.Value, sheet.Cells["B1"].Data.GetValueOrDefault<CellError>());
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/LenFunctionTests.cs

@@ -0,0 +1,59 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class LenFunctionTests
+{
+    [Fact]
+    public void Len_String_ReturnsLength()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A1"].Value = "Phoenix, AZ"; // 11 characters
+        sheet.Cells["B1"].Formula = "=LEN(A1)";
+        Assert.Equal(11d, sheet.Cells["B1"].Data.Value);
+    }
+
+    [Fact]
+    public void Len_BooleanCellTrue_ReturnsFour()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A1"].Value = true;
+        sheet.Cells["B1"].Formula = "=LEN(A1)";
+        Assert.Equal(4d, sheet.Cells["B1"].Data.Value);
+    }
+
+    [Fact]
+    public void Len_BooleanCellFalse_ReturnsFive()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A1"].Value = false;
+        sheet.Cells["B1"].Formula = "=LEN(A1)";
+        Assert.Equal(5d, sheet.Cells["B1"].Data.Value);
+    }
+    [Fact]
+    public void Len_Empty_ReturnsZero()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A1"].Value = null; // empty
+        sheet.Cells["B1"].Formula = "=LEN(A1)";
+        Assert.Equal(0d, sheet.Cells["B1"].Data.Value);
+    }
+
+    [Fact]
+    public void Len_String_WithSpaces_CountsSpaces()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A1"].Value = "     One   "; // 11 characters including spaces
+        sheet.Cells["B1"].Formula = "=LEN(A1)";
+        Assert.Equal(11d, sheet.Cells["B1"].Data.Value);
+    }
+
+    [Fact]
+    public void Len_Number_TreatsAsTextLength()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A1"].Value = 123.45; // "123.45" length 6
+        sheet.Cells["B1"].Formula = "=LEN(A1)";
+        Assert.Equal(6d, sheet.Cells["B1"].Data.Value);
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/LowerFunctionTests.cs

@@ -0,0 +1,24 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class LowerFunctionTests
+{
+    [Fact]
+    public void Lower_ConvertsToLowercase()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A2"].Value = "E. E. Cummings";
+        sheet.Cells["B1"].Formula = "=LOWER(A2)";
+        Assert.Equal("e. e. cummings", sheet.Cells["B1"].Data.Value);
+    }
+
+    [Fact]
+    public void Lower_IgnoresNonLetters()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A3"].Value = "Apt. 2B";
+        sheet.Cells["B1"].Formula = "=LOWER(A3)";
+        Assert.Equal("apt. 2b", sheet.Cells["B1"].Data.Value);
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/MaxAllFunctionTests.cs

@@ -0,0 +1,64 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class MaxAllFunctionTests
+{
+    readonly Sheet sheet = new(10, 10);
+
+    [Fact]
+    public void ShouldEvaluateLogicalValuesInRange()
+    {
+        sheet.Cells["A1"].Value = true;   // 1
+        sheet.Cells["A2"].Value = false;  // 0
+        sheet.Cells["A3"].Value = 5;      // 5
+
+        sheet.Cells["B1"].Formula = "=MAXA(A1:A3)";
+
+        Assert.Equal(5d, sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldTreatTextInRangeAsZeroAndNumericTextAsNumber()
+    {
+        sheet.Cells["A1"].Value = "abc"; // -> 0
+        sheet.Cells["A2"].Value = "15";  // -> 15
+        sheet.Cells["A3"].Value = 10;
+
+        sheet.Cells["B1"].Formula = "=MAXA(A1:A3)";
+
+        Assert.Equal(15d, sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldCountDirectLogicalAndTextArguments()
+    {
+        sheet.Cells["A1"].Formula = "=MAXA(1=1, \"7\", 1=2)"; // TRUE, "7", FALSE -> 7
+        Assert.Equal(7d, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnZeroWhenNoValues()
+    {
+        sheet.Cells["A1"].Value = null; // empty
+        sheet.Cells["A2"].Value = "";  // empty string -> Empty
+
+        sheet.Cells["B1"].Formula = "=MAXA(A1:A2)";
+
+        Assert.Equal(0d, sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldPropagateErrors()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 0;
+        sheet.Cells["A3"].Formula = "=A1/A2"; // #DIV/0!
+
+        sheet.Cells["B1"].Formula = "=MAXA(A1:A3)";
+
+        Assert.Equal(CellError.Div0, sheet.Cells["B1"].Value);
+    }
+}
+
+

Radzen.Blazor.Tests/Spreadsheet/MaxFunctionTests.cs

@@ -0,0 +1,69 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class MaxFunctionTests
+{
+    readonly Sheet sheet = new(10, 10);
+
+    [Fact]
+    public void ShouldReturnLargestValueFromNumbers()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 7;
+        sheet.Cells["A3"].Value = 9;
+        sheet.Cells["A4"].Value = 27;
+        sheet.Cells["A5"].Value = 2;
+
+        sheet.Cells["B1"].Formula = "=MAX(A1:A5)";
+
+        Assert.Equal(27d, sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnLargestValueFromRangeAndLiteral()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 7;
+        sheet.Cells["A3"].Value = 9;
+        sheet.Cells["A4"].Value = 27;
+        sheet.Cells["A5"].Value = 2;
+
+        sheet.Cells["B1"].Formula = "=MAX(A1:A5,30)";
+
+        Assert.Equal(30d, sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldIgnoreNonNumericInRange()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = "text";
+        sheet.Cells["A3"].Value = true;
+        sheet.Cells["A4"].Value = 27;
+        sheet.Cells["A5"].Value = null;
+
+        sheet.Cells["B1"].Formula = "=MAX(A1:A5)";
+
+        Assert.Equal(27d, sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldTreatDirectLogicalAndNumericStringsAsNumbers()
+    {
+        sheet.Cells["A1"].Formula = "=MAX(\"15\", 5, 10)";
+        Assert.Equal(15d, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnZeroWhenNoNumbers()
+    {
+        sheet.Cells["A1"].Value = "a";
+        sheet.Cells["A2"].Value = false;
+        sheet.Cells["A3"].Formula = "=MAX(A1:A2)";
+
+        Assert.Equal(0d, sheet.Cells["A3"].Value);
+    }
+}
+
+

Radzen.Blazor.Tests/Spreadsheet/MidFunctionTests.cs

@@ -0,0 +1,51 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class MidFunctionTests
+{
+    [Fact]
+    public void Mid_Start1_Take5()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A2"].Value = "Fluid Flow"; // length 10
+        sheet.Cells["B1"].Formula = "=MID(A2,1,5)";
+        Assert.Equal("Fluid", sheet.Cells["B1"].Data.Value);
+    }
+
+    [Fact]
+    public void Mid_Start7_Take20_Clamped()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A2"].Value = "Fluid Flow"; // length 10
+        sheet.Cells["B1"].Formula = "=MID(A2,7,20)";
+        Assert.Equal("Flow", sheet.Cells["B1"].Data.Value);
+    }
+
+    [Fact]
+    public void Mid_StartBeyondLength_ReturnsEmpty()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A2"].Value = "Fluid Flow"; // length 10
+        sheet.Cells["B1"].Formula = "=MID(A2,20,5)";
+        Assert.Equal(string.Empty, sheet.Cells["B1"].Data.Value);
+    }
+
+    [Fact]
+    public void Mid_StartLessThan1_ReturnsValueError()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A2"].Value = "Fluid Flow";
+        sheet.Cells["B1"].Formula = "=MID(A2,0,5)";
+        Assert.Equal(CellError.Value, sheet.Cells["B1"].Data.GetValueOrDefault<CellError>());
+    }
+
+    [Fact]
+    public void Mid_NegativeNumChars_ReturnsValueError()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A2"].Value = "Fluid Flow";
+        sheet.Cells["B1"].Formula = "=MID(A2,1,-1)";
+        Assert.Equal(CellError.Value, sheet.Cells["B1"].Data.GetValueOrDefault<CellError>());
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/MinAllFunctionTests.cs

@@ -0,0 +1,64 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class MinAllFunctionTests
+{
+    readonly Sheet sheet = new(10, 10);
+
+    [Fact]
+    public void ShouldEvaluateLogicalValuesInRange()
+    {
+        sheet.Cells["A1"].Value = true;   // 1
+        sheet.Cells["A2"].Value = false;  // 0
+        sheet.Cells["A3"].Value = 5;      // 5
+
+        sheet.Cells["B1"].Formula = "=MINA(A1:A3)";
+
+        Assert.Equal(0d, sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldTreatTextInRangeAsZeroAndNumericTextAsNumber()
+    {
+        sheet.Cells["A1"].Value = "abc"; // -> 0
+        sheet.Cells["A2"].Value = "15";  // -> 15
+        sheet.Cells["A3"].Value = 10;
+
+        sheet.Cells["B1"].Formula = "=MINA(A1:A3)";
+
+        Assert.Equal(0d, sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldCountDirectLogicalAndTextArguments()
+    {
+        sheet.Cells["A1"].Formula = "=MINA(1=1, \"7\", 1=2)"; // TRUE, "7", FALSE -> min is 0
+        Assert.Equal(0d, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnZeroWhenNoValues()
+    {
+        sheet.Cells["A1"].Value = null; // empty
+        sheet.Cells["A2"].Value = "";  // empty string -> Empty
+
+        sheet.Cells["B1"].Formula = "=MINA(A1:A2)";
+
+        Assert.Equal(0d, sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldPropagateErrors()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 0;
+        sheet.Cells["A3"].Formula = "=A1/A2"; // #DIV/0!
+
+        sheet.Cells["B1"].Formula = "=MINA(A1:A3)";
+
+        Assert.Equal(CellError.Div0, sheet.Cells["B1"].Value);
+    }
+}
+
+

Radzen.Blazor.Tests/Spreadsheet/MinFunctionTests.cs

@@ -0,0 +1,69 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class MinFunctionTests
+{
+    readonly Sheet sheet = new(10, 10);
+
+    [Fact]
+    public void ShouldReturnSmallestValueFromNumbers()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 7;
+        sheet.Cells["A3"].Value = 9;
+        sheet.Cells["A4"].Value = 27;
+        sheet.Cells["A5"].Value = 2;
+
+        sheet.Cells["B1"].Formula = "=MIN(A1:A5)";
+
+        Assert.Equal(2d, sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnSmallestValueFromRangeAndLiteral()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = 7;
+        sheet.Cells["A3"].Value = 9;
+        sheet.Cells["A4"].Value = 27;
+        sheet.Cells["A5"].Value = 2;
+
+        sheet.Cells["B1"].Formula = "=MIN(A1:A5,1)";
+
+        Assert.Equal(1d, sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldIgnoreNonNumericInRange()
+    {
+        sheet.Cells["A1"].Value = 10;
+        sheet.Cells["A2"].Value = "text";
+        sheet.Cells["A3"].Value = true;
+        sheet.Cells["A4"].Value = 27;
+        sheet.Cells["A5"].Value = null;
+
+        sheet.Cells["B1"].Formula = "=MIN(A1:A5)";
+
+        Assert.Equal(10d, sheet.Cells["B1"].Value);
+    }
+
+    [Fact]
+    public void ShouldTreatDirectNumericStringsAsNumbers()
+    {
+        sheet.Cells["A1"].Formula = "=MIN(\"15\", 5, 10)";
+        Assert.Equal(5d, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnZeroWhenNoNumbers()
+    {
+        sheet.Cells["A1"].Value = "a";
+        sheet.Cells["A2"].Value = false;
+        sheet.Cells["A3"].Formula = "=MIN(A1:A2)";
+
+        Assert.Equal(0d, sheet.Cells["A3"].Value);
+    }
+}
+
+

Radzen.Blazor.Tests/Spreadsheet/MinuteFunctionTests.cs

@@ -0,0 +1,34 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class MinuteFunctionTests
+{
+    [Fact]
+    public void Minute_FromFraction_ReturnsMinutes()
+    {
+        var sheet = new Sheet(10, 10);
+        // 0.78125 = 18:45 -> minutes 45
+        sheet.Cells["A1"].Data = CellData.FromNumber(0.78125);
+        sheet.Cells["B1"].Formula = "=MINUTE(A1)";
+        Assert.Equal(45, sheet.Cells["B1"].Data.GetValueOrDefault<double>());
+    }
+
+    [Fact]
+    public void Minute_FromDateTimeValue_ReturnsMinute()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A2"].Data = CellData.FromDate(new System.DateTime(2011, 7, 18, 7, 45, 0));
+        sheet.Cells["B2"].Formula = "=MINUTE(A2)";
+        Assert.Equal(45, sheet.Cells["B2"].Data.GetValueOrDefault<double>());
+    }
+
+    [Fact]
+    public void Minute_FromDateOnly_ReturnsZero()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A3"].Data = CellData.FromDate(new System.DateTime(2012, 4, 21));
+        sheet.Cells["B3"].Formula = "=MINUTE(A3)";
+        Assert.Equal(0, sheet.Cells["B3"].Data.GetValueOrDefault<double>());
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/MonthFunctionTests.cs

@@ -0,0 +1,31 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class MonthFunctionTests
+{
+    [Fact]
+    public void Month_FromDateSerial_ReturnsMonth()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A1"].Formula = "=MONTH(VALUE(\"2011-04-15\"))";
+        Assert.Equal(4, sheet.Cells["A1"].Data.GetValueOrDefault<double>());
+    }
+
+    [Fact]
+    public void Month_FromDateValue_ReturnsMonth()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A1"].Data = CellData.FromDate(new System.DateTime(2011, 4, 15));
+        sheet.Cells["B1"].Formula = "=MONTH(A1)";
+        Assert.Equal(4, sheet.Cells["B1"].Data.GetValueOrDefault<double>());
+    }
+
+    [Fact]
+    public void Month_InvalidText_ReturnsValueError()
+    {
+        var sheet = new Sheet(10, 10);
+        sheet.Cells["A1"].Formula = "=MONTH(\"abc\")";
+        Assert.Equal(CellError.Value, sheet.Cells["A1"].Data.GetValueOrDefault<CellError>());
+    }
+}

Radzen.Blazor.Tests/Spreadsheet/NotFunctionTests.cs

@@ -0,0 +1,200 @@
+using Xunit;
+
+namespace Radzen.Blazor.Spreadsheet.Tests;
+
+public class NotFunctionTests
+{
+    readonly Sheet sheet = new(5, 5);
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithTrueValue()
+    {
+        sheet.Cells["A1"].Value = true;
+        sheet.Cells["A2"].Formula = "=NOT(A1)";
+
+        Assert.Equal(false, sheet.Cells["A2"].Value);
+    }
+    
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithEmptyStringAsError()
+    {
+        sheet.Cells["A1"].Value = "";
+        sheet.Cells["A2"].Formula = "=NOT(A1)";
+
+        Assert.Equal(CellError.Value, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithFalseValue()
+    {
+        sheet.Cells["A1"].Value = false;
+        sheet.Cells["A2"].Formula = "=NOT(A1)";
+
+        Assert.Equal(true, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithNumericValue()
+    {
+        sheet.Cells["A1"].Value = 5;
+        sheet.Cells["A2"].Formula = "=NOT(A1)";
+
+        Assert.Equal(false, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithZeroValue()
+    {
+        sheet.Cells["A1"].Value = 0;
+        sheet.Cells["A2"].Formula = "=NOT(A1)";
+
+        Assert.Equal(true, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithStringValue()
+    {
+        sheet.Cells["A1"].Value = "test";
+        sheet.Cells["A2"].Formula = "=NOT(A1)";
+
+        Assert.Equal(CellError.Value, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithEmptyValue()
+    {
+        sheet.Cells["A2"].Formula = "=NOT(A1)";
+
+        Assert.Equal(true, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithComparison()
+    {
+        sheet.Cells["A1"].Value = 50;
+        sheet.Cells["A2"].Formula = "=NOT(A1>100)";
+
+        Assert.Equal(true, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithTrueComparison()
+    {
+        sheet.Cells["A1"].Value = 150;
+        sheet.Cells["A2"].Formula = "=NOT(A1>100)";
+
+        Assert.Equal(false, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnValueErrorForNotFunctionWithNoArguments()
+    {
+        sheet.Cells["A1"].Formula = "=NOT()";
+
+        Assert.Equal(CellError.Value, sheet.Cells["A1"].Value);
+    }
+
+    [Fact]
+    public void ShouldReturnValueErrorForNotFunctionWithMultipleArguments()
+    {
+        sheet.Cells["A1"].Value = true;
+        sheet.Cells["A2"].Value = false;
+        sheet.Cells["A3"].Formula = "=NOT(A1,A2)";
+
+        Assert.Equal(CellError.Value, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithRangeExpression()
+    {
+        sheet.Cells["A1"].Value = true;
+        sheet.Cells["A2"].Formula = "=NOT(A1:A1)";
+
+        Assert.Equal(false, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithDecimalValue()
+    {
+        sheet.Cells["A1"].Value = 0.5m;
+        sheet.Cells["A2"].Formula = "=NOT(A1)";
+
+        Assert.Equal(false, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithNegativeValue()
+    {
+        sheet.Cells["A1"].Value = -5;
+        sheet.Cells["A2"].Formula = "=NOT(A1)";
+
+        Assert.Equal(false, sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionInIfStatement()
+    {
+        sheet.Cells["A1"].Value = 50;
+        sheet.Cells["A2"].Formula = "=IF(NOT(A1>100),\"Valid\",\"Invalid\")";
+
+        Assert.Equal("Valid", sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionInIfStatementWithFalseCondition()
+    {
+        sheet.Cells["A1"].Value = 150;
+        sheet.Cells["A2"].Formula = "=IF(NOT(A1>100),\"Valid\",\"Invalid\")";
+
+        Assert.Equal("Invalid", sheet.Cells["A2"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithProvidedExample1()
+    {
+        sheet.Cells["A2"].Value = 50;
+        sheet.Cells["A3"].Formula = "=NOT(A2>100)";
+
+        Assert.Equal(true, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithProvidedExample2()
+    {
+        sheet.Cells["A2"].Value = 50;
+        sheet.Cells["A3"].Formula = "=IF(AND(NOT(A2>1),NOT(A2<100)),A2,\"The value is out of range\")";
+
+        Assert.Equal("The value is out of range", sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithProvidedExample3()
+    {
+        sheet.Cells["A3"].Value = 100;
+        sheet.Cells["A4"].Formula = "=IF(OR(NOT(A3<0),NOT(A3>50)),A3,\"The value is out of range\")";
+
+        Assert.Equal(100d, sheet.Cells["A4"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithNestedLogicalFunctions()
+    {
+        sheet.Cells["A1"].Value = true;
+        sheet.Cells["A2"].Value = false;
+        sheet.Cells["A3"].Formula = "=NOT(AND(A1,A2))";
+
+        Assert.Equal(true, sheet.Cells["A3"].Value);
+    }
+
+    [Fact]
+    public void ShouldEvaluateNotFunctionWithOrFunction()
+    {
+        sheet.Cells["A1"].Value = false;
+        sheet.Cells["A2"].Value = false;
+        sheet.Cells["A3"].Formula = "=NOT(OR(A1,A2))";
+
+        Assert.Equal(true, sheet.Cells["A3"].Value);
+    }
+}
+
+