def test_str(self):
        """
        Test that str(SSHChannel) works gives the channel name and local and
        remote windows at a glance..
        """
        self.assertEqual(
                str(self.channel), '<SSHChannel channel (lw 131072 rw 0)>')
        self.assertEqual(
                str(channel.SSHChannel(localWindow=1)),
                '<SSHChannel None (lw 1 rw 0)>')

        Test that str(SSHChannel) works gives the channel name and local and
        remote windows at a glance..
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/test/test_channel.py