code: def testJoinGraceExpires(self):
      def TestWithGracePeriod(stop_grace_period):
          coord = coordinator.Coordinator()
          wait_for_stop_ev = threading.Event()
          has_stopped_ev = threading.Event()
          threads = [
              threading.Thread(
                  target=StopOnEvent,
                  args=(coord, wait_for_stop_ev, has_stopped_ev),
              ),
              threading.Thread(target=SleepABit, args=(10.0,)),
          ]
          for t in threads:
              t.daemon = True
              t.start()
          wait_for_stop_ev.set()
          has_stopped_ev.wait()
          with self.assertRaisesRegex(
              RuntimeError, "threads still running"
          ):
              coord.join(
                  threads, stop_grace_period_secs=stop_grace_period
              )
  
      TestWithGracePeriod(1e-10)
      TestWithGracePeriod(0.002)
      TestWithGracePeriod(1.0)
  
imports: import sys
  import threading
  import time
  from tensorflow.python.framework import errors_impl
  from tensorflow.python.platform import test
  from tensorflow.python.training import coordinator
label_desc: Use image node_id 6 for calling the CoordinatorTest obj's underlying member method code with example usage: obj.testJoinGraceExpires() without return types