code: def test_delay_suspends_thread(self) -> None:
      for seconds in 0.2, (0.2, 0.4):
          with self.subTest(seconds=seconds):
              time1 = time.monotonic()
  
              _delay(seconds)  # type: ignore[arg-type]
  
              time2 = time.monotonic()
  
              self.assertGreaterEqual(time2 - time1, 0.2)
  
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 18 for calling the UtilsTest obj's underlying member method code with example usage: obj.test_delay_suspends_thread() without return types