.

Author: SimonCropp

claude.md

@@ -13,13 +13,14 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 dotnet build src --configuration Release
 
 # Run all tests
-dotnet test src --configuration Release
+dotnet test --project src/DiffEngine.Tests --configuration Release
+dotnet test --project src/DiffEngineTray.Tests --configuration Release
 
-# Run a single test file
-dotnet test src/DiffEngine.Tests --filter "FullyQualifiedName~ClassName"
+# Run a single test project with filter
+dotnet test --project src/DiffEngine.Tests --configuration Release --filter "FullyQualifiedName~ClassName"
 
 # Run a specific test
-dotnet test src/DiffEngine.Tests --filter "FullyQualifiedName=DiffEngine.Tests.ClassName.TestMethod"
+dotnet test --project src/DiffEngine.Tests --configuration Release --filter "FullyQualifiedName=DiffEngine.Tests.ClassName.TestMethod"
 ```
 
 **SDK Requirements:** .NET 10 SDK (see `src/global.json`). The project uses preview/prerelease SDK features.
@@ -66,4 +67,4 @@ DiffEngine is a library that manages launching and cleanup of diff tools for sna
 - Tool discovery uses wildcard path matching (`WildcardFileFinder`) to find executables in common install locations
 - Tool order can be customized via `DiffEngine_ToolOrder` environment variable
 - `DisabledChecker` respects `DiffEngine_Disabled` env var
-- Tests use xUnit and Verify for snapshot testing
+- Tests use TUnit and Verify for snapshot testing

src/DiffEngine.Tests/OsSettingsResolverTest.cs

@@ -94,7 +94,6 @@ public async Task EnvPath()
         {
             var found = OsSettingsResolver.TryFindInEnvPath("cmd.exe", out var filePath);
             await Assert.That(found).IsTrue();
-            // TODO: TUnit migration - xUnit Assert.Equal had additional argument(s) (ignoreCase: true) that could not be converted.
             await Assert.That(filePath).IsEqualTo(@"C:\Windows\System32\cmd.exe");
         }
 
@@ -125,7 +124,6 @@ public async Task EnvVar()
             out var filePath,
             out _);
         await Assert.That(found).IsTrue();
-        // TODO: TUnit migration - xUnit Assert.Equal had additional argument(s) (ignoreCase: true) that could not be converted.
         await Assert.That(filePath).IsEqualTo(@"C:\Windows\System32\cmd.exe");
     }
 }

src/DiffEngineTray.Tests/GlobalUsings.cs

@@ -1 +1,8 @@
 global using System.Diagnostics;
+
+[assembly: ParallelLimiter<SingleThreadedLimit>]
+
+public class SingleThreadedLimit : TUnit.Core.Interfaces.IParallelLimit
+{
+    public int Limit => 1;
+}

src/DiffEngineTray.Tests/RecordingTracker.cs

@@ -1,6 +1,4 @@
-using System.Threading.Tasks;
-
-class RecordingTracker() :
+class RecordingTracker() :
     Tracker(
         () =>
         {

src/Directory.Build.props

@@ -14,7 +14,7 @@
     <CheckEolTargetFramework>false</CheckEolTargetFramework>
     <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
     <ResolveAssemblyReferencesSilent>true</ResolveAssemblyReferencesSilent>
-    <NoWarn>CA1416;CS1591;xUnit1051</NoWarn>
+    <NoWarn>CA1416;CS1591</NoWarn>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
     <SuppressNETCoreSdkPreviewMessage>true</SuppressNETCoreSdkPreviewMessage>