def METHOD_NAME(self):
    """
    Invoke exists() with a key and not policy's dict and no connection
    """
    key = ("test", "demo", 1)
    config = TestBaseClass.get_connection_config()
    client1 = aerospike.client(config)
    client1.close()
    try:
        key, _ = client1.exists(key)
    except e.ClusterError as exception:
        assert exception.code == 11