def test_unknown_client_error_with_correct_json(self):
        self.requests_response.expect.status_code.andReturn(400)
        self.requests_response.expect.json().andReturn({"__type": "NobodyKnewThisCouldHappen", "Message": "tralala"})

        with self.assertRaises(_exn.UnknownClientError) as catcher: