'If a L{failure.Failure} is constructed with an exception but no
traceback in Python 3, the traceback will be extracted from the
exception\'s C{__traceback__} attribute.'

def test_tracebackFromExceptionInPython3(self):

    try:
        (1 / 0)
    except:
        (klass, exception, tb) = sys.exc_info()
    f = failure.Failure(exception)
    self.assertIs(f.tb, tb)
