Add filter tests, fix issues found

SabreTools.Test/Filter/PopulationTests.cs

@@ -0,0 +1,78 @@
+using System;
+using SabreTools.Filter;
+using Xunit;
+
+namespace SabreTools.Test.Filter
+{
+    public class PopulationTests
+    {
+        [Fact]
+        public void PopulateFilterRunnerNullListTest()
+        {
+            // Setup the list
+            string[]? filters = null;
+
+            // Setup the filter
+            Assert.Throws<ArgumentNullException>(() => new FilterRunner(filters));
+        }
+
+        [Fact]
+        public void PopulateFilterRunnerEmptyListTest()
+        {
+            // Setup the list
+            string[]? filters = [];
+
+            // Setup the filter runner
+            var filterRunner = new FilterRunner(filters);
+
+            // Check the filters
+            Assert.NotNull(filterRunner.Filters);
+        }
+
+        [Fact]
+        public void PopulateFilterMachineFieldTest()
+        {
+            // Setup the list
+            string[] filters =
+            [
+                "machine.name:foo",
+                "machine.name!:bar",
+            ];
+
+            // Setup the filter
+            var filter = new FilterRunner(filters);
+
+            // Check the filters
+            Assert.Equal(new string[] {"machine", "name"}, filter.Filters[0].Key);
+            Assert.Equal("foo", filter.Filters[0].Value);
+            Assert.Equal(Operation.Equals, filter.Filters[0].Operation);
+
+            Assert.Equal(new string[] {"machine", "name"}, filter.Filters[1].Key);
+            Assert.Equal("bar", filter.Filters[1].Value);
+            Assert.Equal(Operation.NotEquals, filter.Filters[1].Operation);
+        }
+
+        [Fact]
+        public void PopulateFilterDatItemFieldTest()
+        {
+            // Setup the list
+            string[] filters =
+            [
+                "rom.name:foo",
+                "rom.name!:bar"
+            ];
+
+            // Setup the filter
+            var filter = new FilterRunner(filters);
+
+            // Check the filters
+            Assert.Equal(new string[] { "rom", "name"}, filter.Filters[0].Key);
+            Assert.Equal("foo", filter.Filters[0].Value);
+            Assert.Equal(Operation.Equals, filter.Filters[0].Operation);
+
+            Assert.Equal(new string[] { "rom", "name"}, filter.Filters[1].Key);
+            Assert.Equal("bar", filter.Filters[1].Value);
+            Assert.Equal(Operation.NotEquals, filter.Filters[1].Operation);
+        }
+    }
+}