Url: http://blogs.msdn.com/brada/archive/2008/03/18/…

Brad Abrams announced the availablility (as promised at MIX 08) of the source code for the Silverlight controls and all 2000+ unit tests for the controls…including a unit test framework for Silvelright 2. I will have a look once I get home from teaching the Silverlight Tour.  I might have to add Unit Testing to the class ;)

Give it a look if you’re looking for a good way to unit test your own Silverlight 2 applications!