Do not run .NET Framework tests on non-windows platforms by default

[Romfos]

Summary

Now it you will try to run .NET Framework tests on unix platforms on GitHub action you will see an error that mono is not installed

I think that this is not what most of the people want (at least by default)

Make sense to disable is by default

Background and Motivation

Now you need to write code in github actions like that:

      - name: .NET Framework Tests
        if: matrix.os == 'windows-latest'
        run: dotnet test -f net472 

      - name: .NET 8 Tests
        run: dotnet test -f net8.0

      - name: .NET 9 Tests
        run: dotnet test -f net9.0

      - name: .NET 10 Tests
        run: dotnet test -f net10.0 

would be better just to run it like that:

      - name: Tests
        run: dotnet test

Proposed Feature

Do not run .NET Framework tests on non-windows platforms by default in new MTP mode for .NET 10+

Add --run-mono-tests as fallback option for people who needed it

Alternative Designs

status quo

[Youssef1313]

Thanks for opening this.

As a workaround, you can add the following in Directory.Build.targets:

<PropertyGroup Condition="'$(TargetFrameworkIdentifier)' == '.NETFramework' and $([MSBuild]::IsOSUnixLike())">
  <IsTestingPlatformApplication>false</IsTestingPlatformApplication>
</PropertyGroup>

Alternatively, if your test project is multi-targeted, you can only include .NET Framework under a condition.

The feature request here would be specific to dotnet test command and needs to be opened to dotnet/sdk repo. Hence, I'm closing as external.