Unit testing framework for BizTalk solutions

I didn’t know such a thing existed before today, but thanks to a couple of consultants in my office, now I do. The cleverly-named BizUnit is available at codeplex.

The information on this project indicates no dependencies on any existing unit-testing frameworks (NUnit, MbUnit, etc).  Having not used BizUnit, I’m not sure whether that’s good or bad either way.