Visual Studio Team Edition 2008 currently does not support Categories when running tests. Categories (such as implemented in nunit) allow you to run specific subsets of your tests (e.g. You could have a LongRunning category, that only runs tests that are long running)
Visual Studio does allow you to run "TestLists" which are manually configured lists of tests. This program automatically generates a TestList based on the Category property of each test (e.g. TestAttribute("Category", "LongRunning"))
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