Rated 4 out of 5 stars

This is amazingly powerful unit testing framework for unit testing extensions. It could use better getting started documentation, the author primary language is not English so perhaps he should set up a wiki and let others help?
Note to run the sample tests you need to download from SVN, the sample tests are not included in the XPI.

This review is for a previous version of the add-on (0.9.0).