This video introduces the control source and unit test announcement from MIX, and then walks you through:
-exploring the Silverlight 2 Beta 1 control source code, unit test and unit test framework download
-using Visual Studio 2008 to run the control unit tests
-adding the Exclusive attribute to narrow the test(s) that run in the browser when analyzing tests
-running the tests in Firefox
-running the tests in Expression Blend 2.5
[youtube ZiJOxGbLfDQ]