diff --git a/src/Blocktavius.AppDQB2/AssemblyInfo.cs b/src/Blocktavius.AppDQB2/AssemblyInfo.cs
index d9a1bde..10caf64 100644
--- a/src/Blocktavius.AppDQB2/AssemblyInfo.cs
+++ b/src/Blocktavius.AppDQB2/AssemblyInfo.cs
@@ -1,3 +1,4 @@
+using System.Runtime.CompilerServices;
 using System.Windows;
 
 [assembly: ThemeInfo(
@@ -8,3 +9,5 @@
 												//(used if a resource is not found in the page,
 												// app, or any theme specific resource dictionaries)
 )]
+
+[assembly: InternalsVisibleTo("Blocktavius.AppDQB2Tests")]
diff --git a/src/Blocktavius.AppDQB2/Persistence/PolymorphicTypeResolver.cs b/src/Blocktavius.AppDQB2/Persistence/PolymorphicTypeResolver.cs
index 56ec5e9..8c108d6 100644
--- a/src/Blocktavius.AppDQB2/Persistence/PolymorphicTypeResolver.cs
+++ b/src/Blocktavius.AppDQB2/Persistence/PolymorphicTypeResolver.cs
@@ -53,7 +53,11 @@ private static IEnumerable<HillDesignerType> DiscoverHillDesignerTypes() =>
 
 	private static IEnumerable<(Type type, TAttr attr)> DiscoverTypes<TAttr>(Type interfaceType) where TAttr : System.Attribute
 	{
+		// Filter out Microsoft to avoid this error in unit tests:
+		//    Could not load file or assembly 'Microsoft.Build.Utilities.Core, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified.
+		// See also https://github.com/microsoft/testfx/issues/2609
 		var types = AppDomain.CurrentDomain.GetAssemblies()
+			.Where(a => a.FullName?.StartsWith("Microsoft") == false)
 			.SelectMany(asm => asm.GetTypes())
 			.Where(t => t.IsClass && !t.IsAbstract && interfaceType.IsAssignableFrom(t))
 			.ToList();
diff --git a/src/Blocktavius.AppDQB2Tests/Blocktavius.AppDQB2Tests.csproj b/src/Blocktavius.AppDQB2Tests/Blocktavius.AppDQB2Tests.csproj
new file mode 100644
index 0000000..35d9144
--- /dev/null
+++ b/src/Blocktavius.AppDQB2Tests/Blocktavius.AppDQB2Tests.csproj
@@ -0,0 +1,19 @@
+<Project Sdk="MSTest.Sdk/3.6.4">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0-windows7.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <!--
+      Displays error on console in addition to the log file. Note that this feature comes with a performance impact.
+      For more information, visit https://learn.microsoft.com/dotnet/core/testing/unit-testing-platform-integration-dotnet-test#show-failure-per-test
+      -->
+    <TestingPlatformShowTestsFailure>true</TestingPlatformShowTestsFailure>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Blocktavius.AppDQB2\Blocktavius.AppDQB2.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/Blocktavius.AppDQB2Tests/MSTestSettings.cs b/src/Blocktavius.AppDQB2Tests/MSTestSettings.cs
new file mode 100644
index 0000000..aaf278c
--- /dev/null
+++ b/src/Blocktavius.AppDQB2Tests/MSTestSettings.cs
@@ -0,0 +1 @@
+[assembly: Parallelize(Scope = ExecutionScope.MethodLevel)]
diff --git a/src/Blocktavius.AppDQB2Tests/Test1.cs b/src/Blocktavius.AppDQB2Tests/Test1.cs
new file mode 100644
index 0000000..4a4d358
--- /dev/null
+++ b/src/Blocktavius.AppDQB2Tests/Test1.cs
@@ -0,0 +1,54 @@
+using Blocktavius.AppDQB2.Persistence.V1;
+
+namespace Blocktavius.AppDQB2Tests;
+
+[TestClass]
+public sealed class Test1
+{
+	[TestMethod]
+	public void TestMethod1()
+	{
+		const string json =
+			"""
+			{
+			  "ProfileVerificationHash": "SwsLltjL\u002B/NQCgJQGj9kgJhDXTrXlTXHz7cI/fgxuII=",
+			  "SourceSlot": {
+			    "SlotNumber": 3,
+			    "SlotName": "Slot 3 (B02)"
+			  },
+			  "DestSlot": {
+			    "SlotNumber": 1,
+			    "SlotName": "Slot 1 (B00)"
+			  },
+			  "SourceStgdatFilename": "STGDAT16.BIN",
+			  "ChunkExpansion": [],
+			  "Notes": "",
+			  "Images": [],
+			  "MinimapVisible": true,
+			  "ChunkGridVisible": true,
+			  "Scripts": [
+			    {
+			      "ScriptName": "Script 1",
+			      "ScriptNodes": [
+			        {
+			          "$type": "bad discriminator",
+			          "Elevation": 74,
+			          "HillDesigner": {
+			            "$type": "WinsomeHill-4380",
+			            "Steepness": 2
+			          },
+			          "AreaPersistId": "IMG:export\\plateaus\\p1.png",
+			          "BlockPersistId": "BLK:12",
+			          "LockRandomSeed": false
+			        }
+			      ]
+			    }
+			  ],
+			  "SelectedScriptIndex": 11
+			}
+			""";
+
+		var project = ProjectV1.Load(json);
+		Assert.IsNotNull(project);
+	}
+}
diff --git a/src/Blocktavius.sln b/src/Blocktavius.sln
index f24dc0b..daad611 100644
--- a/src/Blocktavius.sln
+++ b/src/Blocktavius.sln
@@ -18,6 +18,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Antipasta", "Antipasta\Antipasta.csproj", "{098197E3-A33F-4D06-B6ED-FA61032DE307}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Blocktavius.AppDQB2Tests", "Blocktavius.AppDQB2Tests\Blocktavius.AppDQB2Tests.csproj", "{DA50C9A5-B158-4162-9C81-DB1086B55D16}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -44,6 +46,10 @@ Global
 		{098197E3-A33F-4D06-B6ED-FA61032DE307}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{098197E3-A33F-4D06-B6ED-FA61032DE307}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{098197E3-A33F-4D06-B6ED-FA61032DE307}.Release|Any CPU.Build.0 = Release|Any CPU
+		{DA50C9A5-B158-4162-9C81-DB1086B55D16}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{DA50C9A5-B158-4162-9C81-DB1086B55D16}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{DA50C9A5-B158-4162-9C81-DB1086B55D16}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{DA50C9A5-B158-4162-9C81-DB1086B55D16}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE