Currently, test cases have no control over output and verbosity. I would propose two possible enhancements:
- give the TestCase read access to the verbosity value (as e.g. `self.verbosity`), to allow for conditional output in tests
- allow test methods to force output buffering (rather than only let the user specify it on the command line), because you would like some stuff to only be printed out on failure; a decorator would IMO be fine