def test_SRV(self):
        """
        The byte stream written by L{dns.Record_SRV.encode} can be used by
        L{dns.Record_SRV.decode} to reconstruct the state of the original
        L{dns.Record_SRV} instance.
        """
        self._recordRoundtripTest(dns.Record_SRV(
                priority=1, weight=2, port=3, target=b'example.com'))

        The byte stream written by L{dns.Record_SRV.encode} can be used by
        L{dns.Record_SRV.decode} to reconstruct the state of the original
        L{dns.Record_SRV} instance.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/names/test/test_dns.py