Unit testing has evolved from a fringe activity to an industry-accepted way to develop software. This change in attitude was aided by the introduction of numerous freely available testing frameworks — most notably, NUnit. Microsoft’s testing options have drawn the ire of the development community for years because there has been a lack of testing support from the company. Non-Microsoft tools require extra product installations and setup, so many developers called for Microsoft to offer such tools with its IDE. Finally, Visual Studio 2008 Professional Edition includes Microsoft’s own unit testing offering. I’ll offer more details about the recent changes in Visual Studio 2008 and survey the current landscape of .NET testing options. Testing options in Visual Studio 2008 Professional Edition Visual Studio 2005 Team System included Microsoft’s testing engine (MSTest), but many developers still clamored for the testing tools to be available to a wider audience. Their efforts paid off, and