Pex - automated white-box testing in .NET

For all you developers out there that are looking for unit testing tools, this may be worth looking into.

"Right from the Visual Studio code editor, Pex finds interesting input-output values of your methods, which you can save as a small test suite with high code coverage. Pex performs a systematic analysis, hunting for boundary conditions, exceptions and assertion failures, which you can debug right away. Pex enables Parameterized Unit Testing, an extension of Unit Testing that reduces test maintenance costs. Pex also comes with a lightweight framework for test stubs and detours, called Stubs and Moles."

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