In Visual Studio 2012, we have done a lot of work to improve the developer unit testing experience, particularly for agile teams. We have even made the entire unit testing framework extensible, which will allow you to use testing frameworks such as xUnit.net and NUnit in addition to the unit testing framework built into Visual Studio. In this talk, we present the history of unit testing in Visual Studio, highlighting why we made this change, and then take you through the product, showing off the features we feel are sure to delight developers.