def test_original_failure_not_error(self):
        dr = EventualResult(succeed(3), None)
        self.assertIdentical(dr.original_failure(), None)
If the result is not an error, original_failure() returns None.
dataset/ETHPy150Open itamarst/crochet/crochet/tests/test_api.py/EventualResultTests.test_original_failure_not_error