How to use the sshtunnel.SSH_TIMEOUT function in sshtunnel

def _check_server_auth(self):
        # Check if authentication to server was successfulZ
        self.ssh_event.wait(sshtunnel.SSH_TIMEOUT)  # wait for transport
        self.assertTrue(self.ssh_event.is_set())
        self.assertTrue(self.ts.is_active())
        self.assertEqual(self.ts.get_username(),
                         SSH_USERNAME)
        self.assertTrue(self.ts.is_authenticated())

    def _do_forwarding(self, timeout=sshtunnel.SSH_TIMEOUT):
        self.log.debug('forward-server Start')
        self.ssh_event.wait(THREADS_TIMEOUT)  # wait for SSH server's transport
        try:
            schan = self.ts.accept(timeout=timeout)
            info = "forward-server schan <> echo"
            self.log.info(info + " accept()")
            echo = socket.create_connection(
                (self.eaddr, self.eport)
            )
            while self.is_server_working:
                rqst, _, _ = select.select([schan, echo],
                                           [],
                                           [],
                                           timeout)
                if schan in rqst:
                    data = schan.recv(1024)

ECDSA = b'\x25\x19\xeb\x55\xe6\xa1\x47\xff\x4f\x38\xd2\x75\x6f\xa5\xd5\x60'
FINGERPRINTS = {
    'ssh-dss': SSH_DSS,
    'ssh-rsa': SSH_RSA,
    'ecdsa-sha2-nistp256': ECDSA,
}
DAEMON_THREADS = False
HERE = path.abspath(path.dirname(__file__))
THREADS_TIMEOUT = 5.0
PKEY_FILE = 'testrsa.key'
ENCRYPTED_PKEY_FILE = 'testrsa_encrypted.key'
TEST_CONFIG_FILE = 'testconfig'
TEST_UNIX_SOCKET = get_test_data_path('test_socket')

sshtunnel.TRACE = True
sshtunnel.SSH_TIMEOUT = 1.0


# TESTS

class MockLoggingHandler(logging.Handler, object):
    """Mock logging handler to check for expected logs.

    Messages are available from an instance's `messages` dict, in order,
    indexed by a lowercase log level string (e.g., 'debug', 'info', etc.).
    """

    def __init__(self, *args, **kwargs):
        self.messages = {'debug': [], 'info': [], 'warning': [], 'error': [],
                         'critical': [], 'trace': []}
        super(MockLoggingHandler, self).__init__(*args, **kwargs)