... just a random remark: [...]
Also I've found that if there's an error in your class' setUp(), it can cause the test to hang and never show you a traceback.
I have run into a similar problem; this seems to be caused by the (usually reasonable) behaviour of the pyunit not to call the "tearDown" method of a test faiming in "setUp". Unfortunately in the context of unittesting Zope this results in a pending connection if the connection happends after the "get_transaction().begin()". After few tests, all availabe connections seems to be busy and the test hang. I have been able to fix this for my local tests by surrounding the code in the setUp with an 'try: ... excecpt:" block, where the "except:" block aborts the transaction before reraising the exception. This fixes the issue with the hang; one gets plain tracebacks telling what went wrong in the setUp. Looking at the more sophisticated structure of the CMF-tests this may be a bit tricky to apply this patch there. Cheers, Clemens