It looks like the base code was in the April2010 toolkit there, but it was not completely completed. The idea is for your TestClass to have a property TestContext TestContext {get; set;}that will be automatically set by the framework. Then in TestMethod callTestContext.WriteLine()
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http://www.codeplex.com/Download?ProjectName=silverlight&DownloadId=295575
2010 . Silverlight Toolkit Infrastructure.zip, Microsoft.Silverlight.Testing.dll