How to use the sshtunnel.create_logger function in sshtunnel

def __init__(self, *args, **kwargs):
        # Allow tests to enable/disable specific key types
        self.__allowed_keys = kwargs.pop('allowed_keys', [])
        self.log = kwargs.pop('log', sshtunnel.create_logger(loglevel='DEBUG'))
        super(NullServer, self).__init__(*args, **kwargs)

def test_tracing_logging(self):
        """
        Test that Tracing mode may be enabled for more fine-grained logs
        """
        logger = sshtunnel.create_logger(logger=self.log,
                                         loglevel='TRACE')
        with self._test_server(
            (self.saddr, self.sport),
            ssh_username=SSH_USERNAME,
            ssh_password=SSH_PASSWORD,
            remote_bind_address=(self.eaddr, self.eport),
            logger=logger,
        ) as server:
            server.logger = sshtunnel.create_logger(logger=server.logger,
                                                    loglevel='TRACE')
            message = get_random_string(100).encode()
            # Windows raises WinError 10049 if trying to connect to 0.0.0.0
            s = socket.create_connection(('127.0.0.1', server.local_bind_port))
            s.send(message)
            s.recv(100)
            s.close

def setUpClass(cls):
        super(SSHClientTest, cls).setUpClass()
        socket.setdefaulttimeout(sshtunnel.SSH_TIMEOUT)
        cls.log = logging.getLogger(sshtunnel.__name__)
        cls.log = sshtunnel.create_logger(logger=cls.log,
                                          loglevel='DEBUG')
        cls._sshtunnel_log_handler = MockLoggingHandler(level='DEBUG')
        cls.log.addHandler(cls._sshtunnel_log_handler)
        cls.sshtunnel_log_messages = cls._sshtunnel_log_handler.messages
        # set verbose format for logging
        _fmt = '%(asctime)s| %(levelname)-4.3s|%(threadName)10.9s/' \
               '%(lineno)04d@%(module)-10.9s| %(message)s'
        for handler in cls.log.handlers:
            handler.setFormatter(logging.Formatter(_fmt))

logger=logger,
        ) as server:
            server.logger = sshtunnel.create_logger(logger=server.logger,
                                                    loglevel='TRACE')
            message = get_random_string(100).encode()
            # Windows raises WinError 10049 if trying to connect to 0.0.0.0
            s = socket.create_connection(('127.0.0.1', server.local_bind_port))
            s.send(message)
            s.recv(100)
            s.close
            log = 'send to {0}'.format((self.eaddr, self.eport))

        self.assertTrue(any(log in l for l in
                            self.sshtunnel_log_messages['trace']))
        # set loglevel back to the original value
        logger = sshtunnel.create_logger(logger=self.log,
                                         loglevel='DEBUG')

def test_tracing_logging(self):
        """
        Test that Tracing mode may be enabled for more fine-grained logs
        """
        logger = sshtunnel.create_logger(logger=self.log,
                                         loglevel='TRACE')
        with self._test_server(
            (self.saddr, self.sport),
            ssh_username=SSH_USERNAME,
            ssh_password=SSH_PASSWORD,
            remote_bind_address=(self.eaddr, self.eport),
            logger=logger,
        ) as server:
            server.logger = sshtunnel.create_logger(logger=server.logger,
                                                    loglevel='TRACE')
            message = get_random_string(100).encode()
            # Windows raises WinError 10049 if trying to connect to 0.0.0.0
            s = socket.create_connection(('127.0.0.1', server.local_bind_port))
            s.send(message)
            s.recv(100)
            s.close
            log = 'send to {0}'.format((self.eaddr, self.eport))

        self.assertTrue(any(log in l for l in
                            self.sshtunnel_log_messages['trace']))
        # set loglevel back to the original value
        logger = sshtunnel.create_logger(logger=self.log,
                                         loglevel='DEBUG')