Has any of the alt.net unit testing frameworks embraced .net 4.0 framework?
NUnit 2.5.5 includes support for .NET 4.0:
NUnit 2.5.5 release is updated to work with the final release of .NET 4.0 and provides additional capabilities in defining theories.
This releases fixes several problems on x64 platforms and includes support for Visual Studio 2010 and .Net Framework 4.0 Beta 2.