PEX and Moles – Promising White Box Unit Testing

Pex automatically generates test from Visual Studio code editor. It tries interesting sets of input and output of a method. This provide a high level of test coverage automatically. Currently it is a Visual Studio add in for testing .NET Framework Applications

Moles supports Unit Testing by isolation with detours and stubs.

http://research.microsoft.com/en-us/projects/pex/

You can try it out online with no install at: http://www.pexforfun.com/