How to configure unit testing for C# (dotnet test)

I’d like to run dotnet test on all *.sln files in my repository when calling arc diff.
I’ve tried to specify XUnitTestEngine in my .arcunit file, but I’m getting the following error:

Usage Exception: Test engine 'XUnitTestEngine' specifies invalid type 'XUnitTestEngine'. Available test engines are: phutil.

Could anyone point to right direction on how to configure non-php unit testing with arcanist.
Thank you,