def METHOD_NAME(self):
    self.sub.channels(['ch1', 'ch2', 'ch3'])
    self.assertEqual(self.sub.build_path(), Subscribe.SUBSCRIBE_PATH
                     % (pnconf.subscribe_key, "ch1,ch2,ch3"))
    self.assertEqual(self.sub.build_params_callback()({}), {
        'pnsdk': sdk_name,
        'uuid': self.pubnub.uuid
    })
    self.assertEqual(self.sub._channels, ['ch1', 'ch2', 'ch3'])