code: def test_try_parse_port_returns_port(self) -> None:
      port = _try_parse_port("123")
  
      self.assertEqual(port, 123)
  
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 5 for calling the UtilsTest obj's underlying member method code with example usage: obj.test_try_parse_port_returns_port() without return types