def test_overflowIpv6(self):
        """
        Test that overflow bits are preserved during feed parsing for IPv6.
        """
        testValue = b'TEST DATA\r\n\r\nTEST DATA'
        header = _makeHeaderIPv6() + testValue
        parser = _v2parser.V2Parser()
        info, overflow = parser.feed(header)
        self.assertTrue(info)
        self.assertEqual(overflow, testValue)

        Test that overflow bits are preserved during feed parsing for IPv6.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/protocols/haproxy/test/test_v2parser.py