'Construct a L{Failure} with an exception 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 _brokenValueTest(self, detail):

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