diff --git a/SabreTools.Serialization.Test/Readers/NESCartTests.cs b/SabreTools.Serialization.Test/Readers/NESCartTests.cs
new file mode 100644
index 00000000..532ebce1
--- /dev/null
+++ b/SabreTools.Serialization.Test/Readers/NESCartTests.cs
@@ -0,0 +1,73 @@
+using System.IO;
+using System.Linq;
+using SabreTools.Serialization.Readers;
+using Xunit;
+
+namespace SabreTools.Serialization.Test.Readers
+{
+    public class NESCartTests
+    {
+        [Fact]
+        public void NullArray_Null()
+        {
+            byte[]? data = null;
+            int offset = 0;
+            var deserializer = new NESCart();
+
+            var actual = deserializer.Deserialize(data, offset);
+            Assert.Null(actual);
+        }
+
+        [Fact]
+        public void EmptyArray_Null()
+        {
+            byte[]? data = [];
+            int offset = 0;
+            var deserializer = new NESCart();
+
+            var actual = deserializer.Deserialize(data, offset);
+            Assert.Null(actual);
+        }
+
+        [Fact]
+        public void InvalidArray_Null()
+        {
+            byte[]? data = [.. Enumerable.Repeat<byte>(0xFF, 1024)];
+            int offset = 0;
+            var deserializer = new NESCart();
+
+            var actual = deserializer.Deserialize(data, offset);
+            Assert.Null(actual);
+        }
+
+        [Fact]
+        public void NullStream_Null()
+        {
+            Stream? data = null;
+            var deserializer = new NESCart();
+
+            var actual = deserializer.Deserialize(data);
+            Assert.Null(actual);
+        }
+
+        [Fact]
+        public void EmptyStream_Null()
+        {
+            Stream? data = new MemoryStream([]);
+            var deserializer = new NESCart();
+
+            var actual = deserializer.Deserialize(data);
+            Assert.Null(actual);
+        }
+
+        [Fact]
+        public void InvalidStream_Null()
+        {
+            Stream? data = new MemoryStream([.. Enumerable.Repeat<byte>(0xFF, 1024)]);
+            var deserializer = new NESCart();
+
+            var actual = deserializer.Deserialize(data);
+            Assert.Null(actual);
+        }
+    }
+}
diff --git a/SabreTools.Serialization.Test/Wrappers/NESCartTests.cs b/SabreTools.Serialization.Test/Wrappers/NESCartTests.cs
new file mode 100644
index 00000000..ba09a1db
--- /dev/null
+++ b/SabreTools.Serialization.Test/Wrappers/NESCartTests.cs
@@ -0,0 +1,61 @@
+using System.IO;
+using System.Linq;
+using SabreTools.Serialization.Wrappers;
+using Xunit;
+
+namespace SabreTools.Serialization.Test.Wrappers
+{
+    public class NESCartTests
+    {
+        [Fact]
+        public void NullArray_Null()
+        {
+            byte[]? data = null;
+            int offset = 0;
+            var actual = NESCart.Create(data, offset);
+            Assert.Null(actual);
+        }
+
+        [Fact]
+        public void EmptyArray_Null()
+        {
+            byte[]? data = [];
+            int offset = 0;
+            var actual = NESCart.Create(data, offset);
+            Assert.Null(actual);
+        }
+
+        [Fact]
+        public void InvalidArray_Null()
+        {
+            byte[]? data = [.. Enumerable.Repeat<byte>(0xFF, 1024)];
+            int offset = 0;
+            var actual = NESCart.Create(data, offset);
+            Assert.Null(actual);
+        }
+
+        [Fact]
+        public void NullStream_Null()
+        {
+            Stream? data = null;
+            var actual = NESCart.Create(data);
+            Assert.Null(actual);
+        }
+
+        [Fact]
+        public void EmptyStream_Null()
+        {
+            Stream? data = new MemoryStream([]);
+            var actual = NESCart.Create(data);
+            Assert.Null(actual);
+        }
+
+        [Fact]
+        public void InvalidStream_Null()
+        {
+            Stream? data = new MemoryStream([.. Enumerable.Repeat<byte>(0xFF, 1024)]);
+            var actual = NESCart.Create(data);
+            Assert.Null(actual);
+        }
+    }
+}
diff --git a/SabreTools.Serialization/Models/README.MD b/SabreTools.Serialization/Models/README.MD
index 08424b40..6756a39a 100644
--- a/SabreTools.Serialization/Models/README.MD
+++ b/SabreTools.Serialization/Models/README.MD
@@ -36,6 +36,7 @@ Not all of this information was able to be gathered directly from the files in q
 | [Matthew Russotto](http://www.russotto.net/quantumcomp.html) | Compression/Quantum |
 | [Microsoft Learn](https://learn.microsoft.com/en-us/) | BMP, CFB, Compression/LZX, Compression/MSZIP, MicrosoftCabinet, OLE, PortableExecutable, SecuROM, WiseInstaller |
 | [msitools](https://github.com/GNOME/msitools/) | CFB |
+| [Nesdev Wiki](https://www.nesdev.org/wiki/Nesdev_Wiki) | NESCart |
 | [OSDev.org](https://wiki.osdev.org/Expanded_Main_Page) | MSDOS, NewExecutable |
 | [PInvoke.net](http://www.pinvoke.net/index.aspx) | MSDOS |
 | [PKWARE(?)](https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT) | PKZIP |