Coverlet 8 has a bug that prevents it from generating coverage for .NET Framework projects, possibly related to the version of .NET (Core) installed on the computer, and the comments in coverlet-coverage/coverlet #1818 and #1812 are very confusing about whether .NET Framework is even still supported, or how to make it work, or why it regressed, or when it will be fixed, especially when issues are being closed despite users reporting that the latest preview builds don't fix the issue and continue to crash, and then the issue just gets closed with a link to an irrelevant, unhelpful Microsoft documentation page that's unrelated to the problem and doesn't fix anything.

Author: Aldaviva

.github/workflows/dotnetframework.yml

@@ -32,8 +32,8 @@ jobs:
         # build again in Debug mode just for tests because Release tests would have duplicate dependencies as ILRepacked release code under test, causing error CS0433: The type 'LogLevel' exists in both 'Fail2Ban4Win, Version=1.0.1.0, Culture=neutral, PublicKeyToken=null' and 'NLog, Version=5.0.0.0, Culture=neutral, PublicKeyToken=5120e14c03d0593c' [D:\a\Fail2Ban4Win\Fail2Ban4Win\Tests\Tests.csproj]
       - name: Test
         run: |
-          msbuild -p:Configuration=Debug -t:build -m
-          dotnet test --no-build --verbosity normal --configuration Debug --collect:"XPlat Code Coverage" --settings Tests\Tests.runsettings --logger "trx;LogFileName=TestResults.xml"
+          msbuild Tests -p:Configuration=Debug -t:build -m -verbosity:minimal
+          dotnet test Tests --no-build --verbosity normal --configuration Debug --collect:"XPlat Code Coverage" --settings Tests\Tests.runsettings --logger "trx;LogFileName=TestResults.xml"
           Out-File -InputObject "TEST_EXIT_CODE=$LASTEXITCODE" -FilePath $env:GITHUB_ENV -Append -Encoding UTF8
           Copy-Item Tests/TestResults/*/coverage.info Tests/TestResults -ErrorAction Continue
           exit 0

Tests/Tests.csproj

@@ -2,10 +2,10 @@
 
     <PropertyGroup>
         <TargetFramework>net472</TargetFramework>
+        <LangVersion>latest</LangVersion>
 
         <IsPackable>false</IsPackable>
-
-        <LangVersion>latest</LangVersion>
+        <IsTestProject>true</IsTestProject>
     </PropertyGroup>
 
     <ItemGroup>
@@ -19,7 +19,7 @@
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>
         </PackageReference>
-        <PackageReference Include="coverlet.collector" Version="8.0.0">
+        <PackageReference Include="coverlet.collector" Version="[6.0.4,8)">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>
         </PackageReference>