def test_messageExists(self):
        """
        If a C{message} argument is passed to the L{Error} constructor, the
        C{message} isn't affected by the value of C{status}.
        """
        e = error.Error(b"200", b"My own message")
        self.assertEqual(e.message, b"My own message")

        If a C{message} argument is passed to the L{Error} constructor, the
        C{message} isn't affected by the value of C{status}.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/test/test_error.py