code: def testWatchDogTimeout(self, use_env_var):
      tmp_file = self.create_tempfile()
      f = open(tmp_file, "w+")
  
      triggerred_count = [0]
  
      def on_triggered_fn():
          triggerred_count[0] += 1
  
      timeout = 3
      if use_env_var:
          os.environ["TF_CLUSTER_COORDINATOR_WATCH_DOG_TIMEOUT"] = str(
              timeout
          )
          wd = watchdog.WatchDog(
              traceback_file=f, on_triggered=on_triggered_fn
          )
      else:
          wd = watchdog.WatchDog(
              timeout=timeout,
              traceback_file=f,
              on_triggered=on_triggered_fn,
          )
      time.sleep(6)
  
      self.assertGreaterEqual(triggerred_count[0], 1)
      wd.report_closure_done()
      time.sleep(1)
      self.assertGreaterEqual(triggerred_count[0], 1)
      time.sleep(5)
      self.assertGreaterEqual(triggerred_count[0], 2)
  
      wd.stop()
      time.sleep(5)
      last_triggered_count = triggerred_count[0]
      time.sleep(10)
      self.assertEqual(last_triggered_count, triggerred_count[0])
  
      f.close()
      with open(tmp_file) as f:
          self.assertIn("Current thread", f.read())
  
file_path: tensorflow-upstream/tensorflow/python/distribute/coordinator/watchdog_test.py
imports: import os
  import time
  from absl.testing import parameterized
  from tensorflow.python.distribute.coordinator import watchdog
  from tensorflow.python.eager import test
label_desc: Use image node_id 1 for calling the WatchDogTest obj's underlying member method code with example usage: obj.testWatchDogTimeout(use_env_var) without return types