Try to force dotnet 8 for the vs2022 test run

Author: GrahamTheCoder

.github/workflows/dotnet-tests.yml

@@ -20,6 +20,10 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
+    - name: Create global.json to enforce .NET 8 for MSBuild
+      if: inputs.dotnet-version == '8.0.x'
+      run: echo '{"sdk":{"version":"8.0.0","rollForward":"latestFeature"}}' > global.json
+
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
@@ -33,8 +37,11 @@ jobs:
     - name: Log MSBuild version
       run: msbuild -version
 
+    - name: Log .NET version
+      run: dotnet --info
+
     - name: Build
       run: dotnet build DotNetBuildable.slnf /p:Configuration=Release
 
     - name: Execute unit tests
-      run: dotnet test Tests/bin/Release/ICSharpCode.CodeConverter.Tests.dll
+      run: dotnet test Tests/Tests.csproj -c Release --framework net${{ inputs.dotnet-version == '8.0.x' && '8.0' || '10.0' }} --no-build

Tests/Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>net10.0</TargetFramework>
+    <TargetFrameworks>net8.0;net10.0</TargetFrameworks>
     <OutputType>Library</OutputType>
     <AssemblyName>ICSharpCode.CodeConverter.Tests</AssemblyName>
     <RootNamespace>ICSharpCode.CodeConverter.Tests</RootNamespace>