As part of building my WP7 app, I spent a fair amount of time trying to get code coverage working for my unit tests. I tried a number of different approaches including using the Silverlight Unit Test Framework and NUnit + dotCover. I finally landed on an approach that worked for me using the unit testing capabilities in Visual Studio 2010. Since this is a much confused topic with very little info on the web on how to successfully get working for Silverlight/Windows Phone apps, I published a screencast on the subject.  I hope you find it useful.

Direct link:

https://channel9.msdn.com/posts/Code-Coverage-for-Silverlight-and-Windows-Phone-ViewModels

From http://en.wikipedia.org/wiki/Code_coverage:

"Code coverage is a measure used in software testing. It describes the degree to which the source code of a program has been tested."

In this screencast, you will learn how to get code coverage for your Silverlight and/or Windows Phone ViewModels through unit testing.  You can learn more about code coverage in Visual Studio 2010 from:

http://msdn.microsoft.com/en-us/library/dd537628.aspx