def test_proxyCommandUnix(self):
        """
        Test that proxy returns endpoint data for UNIX connections.
        """
        header = _makeHeaderUnix(verCom=b'\x21')
        info = _v2parser.V2Parser.parse(header)
        self.assertTrue(info.source)
        self.assertIsInstance(info.source, address.UNIXAddress)
        self.assertTrue(info.destination)
        self.assertIsInstance(info.destination, address.UNIXAddress)

        Test that proxy returns endpoint data for UNIX connections.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/protocols/haproxy/test/test_v2parser.py