def test_fullParsingSuccess_UNKNOWN(self):
        """
        Test that parsing is successful for a UNKNOWN PROXY header.
        """
        info = _v1parser.V1Parser.parse(
            b'PROXY UNKNOWN anything could go here',
        )
        self.assertIsNone(info.source)
        self.assertIsNone(info.destination)

        Test that parsing is successful for a UNKNOWN PROXY header.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/protocols/haproxy/test/test_v1parser.py