def test_retryIfFailedDueToNonCancelException(self):
        """
        If a request failed with L{ResponseNeverReceived} due to some
        arbitrary exception, C{_shouldRetry} returns C{True} to indicate the
        request should be retried.
        """
        pool = client.HTTPConnectionPool(None)
        connection = client._RetryingHTTP11ClientProtocol(None, pool)
        self.assertTrue(connection._shouldRetry(
            b"GET", ResponseNeverReceived([Failure(Exception())]), None))

        If a request failed with L{ResponseNeverReceived} due to some
        arbitrary exception, C{_shouldRetry} returns C{True} to indicate the
        request should be retried.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/test/test_agent.py