'Construct a L{Failure} with an exception type that raises an exception
from its C{__str__} method and then call C{getTraceback} with the
specified detail and verify that it returns a string.'

def _brokenTypeTest(self, detail):

    f = failure.Failure(BrokenExceptionType())
    traceback = f.getTraceback(detail=detail)
    self.assertIsInstance(traceback, str)
