如何为Visual Studio 2015 RC / .NET Core项目创建单元测试？

I've just started to play around with the new Visual Studio 2015 RC but I've run into a problem in that I can't seem to find an example project that shows how to unit-test the new .NET COre code. An example or even being pointed in the right direction would be very helpful. Thanks....I've just started to play around with the new V