def METHOD_NAME(self):
    logger, handler, sub = self.connect_handler()
    handler.formatters[logging.INFO] = logging.Formatter("%(message)s UNITTEST\n")
    handler.socket.bind(self.iface)
    sub.setsockopt(zmq.SUBSCRIBE, handler.root_topic.encode())
    logger.info('info message')
    topic, msg = sub.recv_multipart()
    assert msg == b'info message UNITTEST\n'
    logger.removeHandler(handler)