code: def test_matches_machine_hostname_returns_true_if_hostname_is_machine_fqdn(
      self,
  ) -> None:
      host = socket.getfqdn()
  
      self.assertTrue(_matches_machine_hostname(host))
  
imports: import threading
  import time
  import socket
  from datetime import timedelta
  from typing import List
  from unittest import TestCase
  from unittest.mock import patch
  from torch.distributed.elastic.rendezvous.utils import _PeriodicTimer, _delay, _matches_machine_hostname, _parse_rendezvous_config, _try_parse_port, parse_rendezvous_endpoint
label_desc: Use image node_id 15 for calling the UtilsTest obj's underlying member method code with example usage: obj.test_matches_machine_hostname_returns_true_if_hostname_is_machine_fqdn() without return types