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Hi Jeremy,

This behaviour is actually known and intentional; the 
dangers are documented as a caveat in the PyUnit docs. The 
intention was that a test runner (GUI or otherwise) could 
potentially make the traceback available for inspection 
when a test fails, to aid in debugging.

In your particular case, relying on GC to close the file 
might have caused problems with following code even if 
PyUnit didn't store the traceback.

Overall I'd prefer to keep storing the tracebacks, 
especially since they only get stored when tests fail. It 
would be worth me adding a note about GC interaction to 
the docs, though.