It’s open source (under the Apache License), and Gallio is now in Alpha, with support for running MbUnit tests, but also NUnit, xUnit.net and NBehave … and includes integration and tool support which is unparalleled: integration with CCNet and NAnt, MSBuild and the new Microsoft Research testing tool Pex and … well, lots of other tools you can read about on their website … my point is that it has PowerShell integration!

Although Gallio includes it’s own command-line runner called Echo, and a very nice GUI called Icarus, they’ve also included a PowerShell cmdlet test-runner which supports more options that you can shake a stick at (see source code here), including allowing you to choose LocalAppDomain, IsolatedAppDomain, or IsolatedProcess test runners, etc.

That’s all I’ve got for now … this is only the second alpha release, but feel free to check it out anyway, the test model is complete, and it’s actually running tests without major issues.