def test_additional(self):
        """
        Two L{dns.Message} instances compare equal if they have the same
        additional records.
        """
        self.assertNormalEqualityImplementation(
            self.messageFactory(additional=[dns.RRHeader(
                        b'example.com', payload=dns.Record_A('1.2.3.4'))]),
            self.messageFactory(additional=[dns.RRHeader(
                        b'example.com', payload=dns.Record_A('1.2.3.4'))]),
            self.messageFactory(additional=[dns.RRHeader(
                        b'example.org', payload=dns.Record_A('1.2.3.4'))]),
            )

        Two L{dns.Message} instances compare equal if they have the same
        additional records.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/names/test/test_dns.py