On Friday, we released the first preliminary version of an experimental library with test APIs, named ... TestApi :). With this library, we are sharing internal Microsoft testing technology with the developer and tester community.
We wanted to keep the first release small and contained, so that it can be easily grasped and critiqued, but complete enough to provide actual user value and to clearly demonstrate the direction of this effort.
In addition to the binaries and the source code, we have provided full documentation (both MSDN-style API documents and conceptual documents) as well as a couple of VSTS samples to get you started.
Check out the release on http://codeplex.com/TestApi and let us know what you think.