Microsoft's member of xUnit family does not seem to have a formal name other than its namespace Microsoft.VisualStudio.TestTools.UnitTesting but MSTest is the name people typically use to refer to it. Technically, it is just the name of the Command-Line Test Runner mstest.exe. MSTest's main claim to fame is that it ships with Visual Studio 2005 Team System (TM). As far as I know it is not available in the less expensive versions of Visual Studio or for free download. It has a number of innovative features including direct support for Data-Driven Tests. Information is available on MSDN at http://msdn.microsoft.com/en-us/library/ms182516.aspx. Other (and cheaper) options for .Net programmers are NUnit, CsUnit and MbUnit.
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