code: def testRequestStopRaisesIfJoined(self):
      coord = coordinator.Coordinator()
      # Join the coordinator right away.
      coord.join([])
      reported = False
      with self.assertRaisesRegex(RuntimeError, "Too late"):
          try:
              raise RuntimeError("Too late")
          except RuntimeError as e:
              reported = True
              coord.request_stop(e)
      self.assertTrue(reported)
      # If we clear_stop the exceptions are handled normally.
      coord.clear_stop()
      try:
          raise RuntimeError("After clear")
      except RuntimeError as e:
          coord.request_stop(e)
      with self.assertRaisesRegex(RuntimeError, "After clear"):
          coord.join([])
  
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 14 for calling the CoordinatorTest obj's underlying member method code with example usage: obj.testRequestStopRaisesIfJoined() without return types