def test_writeSequence(self):
        """
        When a sequence is passed to the writeSequence method, it should be
        joined together and sent to the session channel's write method.
        """
        self.pp.writeSequence([b'test ', b'data'])
        self.assertEqual(self.session.conn.data[self.session],
                [b'test data'])

        When a sequence is passed to the writeSequence method, it should be
        joined together and sent to the session channel's write method.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/test/test_session.py