Cannot produce .cs classes trying to do Intellitests with Visual Studio Enterprise 2015

I try to create Intellitests with Visual Studio Enterprise. So far I had no problem creating them. (Create Intellitest - > Run etc.)
This time the .cs class is not generated although I get no errors/warnings at all

Creating Project Game.Tests6 visibility: exported or assembly(Game) Processing 0 types Processing Game Scanning assembly references in Game Applying template AssemblyInfo to Game Applying template Tests to Game generating method bodies flushing generated code updating assembly references finished

Is there anyone faced the same problem ??