code: def test_matches_machine_hostname_returns_true_if_hostname_is_machine_address(
      self,
  ) -> None:
      addr_list = socket.getaddrinfo(
          socket.gethostname(), None, proto=socket.IPPROTO_TCP
      )
  
      for addr in (addr_info[4][0] for addr_info in addr_list):
          with self.subTest(addr=addr):
              self.assertTrue(_matches_machine_hostname(addr))
  
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 16 for calling the UtilsTest obj's underlying member method code with example usage: obj.test_matches_machine_hostname_returns_true_if_hostname_is_machine_address() without return types