def test_deferred_failure_result(self):
        passthrough = self.make_wrapped_function()
        self.assertRaises(
            ZeroDivisionError, passthrough, fail(ZeroDivisionError()))
If the underlying function returns a Deferred with an errback, the
dataset/ETHPy150Open itamarst/crochet/crochet/tests/test_api.py/WaitTestsMixin.test_deferred_failure_result