The Microsoft Test project template in Microsoft Visual Studio 2010 does not support adding a reference to a Silverlight class library. To unittest a function in a Silverlight class library you can follow the steps below:


– Install the Microsoft Silverlight Toolkit April 2010 (

– After installing the Microsoft Silverlight Toolkit April 2010, you can find a [Silverlight Unit Test Application] project template, under Installed Templates > Visual C# > Silverlight in the Add New Project wizard in Microsoft Visual Studio 2010.



– This will add 2 projects to your solution, a [test project] and a [test application] to run the Silverlight unittests in the browser.

– Add a reference in the [test project] to the Silverlight class library to test.

– Now you can run the unittest in a browser by starting the [test application]:




If you don’t want to run the silverlight unittests in the browser, but directly in Microsoft Visual Studio 2010, like normal unittests, follow the steps below:


– Install Jetbrains resharper

– Download the JetBrains Resharper plugin agunit []

– Create the folder [C:\Program Files (x86)\JetBrains\ReSharper\v6.0\Bin\Plugins\AgUnit] if it does not exist.

– Extract the agunit zip and add the contents to the folder: [C:\Program Files (x86)\JetBrains\ReSharper\v6.0\Bin\Plugins\AgUnit].

– Open your solution containing the Silverlight test project in Microsoft Visual Studio 2010 and click on the green circle next to your silverlight unittest:




You can now run your Silverlight unittest directly from Microsoft Visual Studio 2010


You can add only a Silverlight [test project], without the [test application] to a solution by unchecking the [Host the Silverlight application in a new or existing Web site in the solution] checkbox:


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