code: def testGracePeriod(self):
      with self.cached_session() as sess:
          # The enqueue will quickly block.
          queue = data_flow_ops.FIFOQueue(2, dtypes.float32)
          enqueue = queue.enqueue((10.0,))
          dequeue = queue.dequeue()
          qr = queue_runner_impl.QueueRunner(queue, [enqueue])
          coord = coordinator.Coordinator()
          qr.create_threads(sess, coord, start=True)
          # Dequeue one element and then request stop.
          dequeue.op.run()
          time.sleep(0.02)
          coord.request_stop()
          # We should be able to join because the RequestStop() will cause
          # the queue to be closed and the enqueue to terminate.
          coord.join(stop_grace_period_secs=1.0)
  
imports: import collections
  import time
  from tensorflow.python.client import session
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors_impl
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import control_flow_ops
  from tensorflow.python.ops import data_flow_ops
  from tensorflow.python.ops import variable_v1
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
  from tensorflow.python.training import coordinator
  from tensorflow.python.training import monitored_session
  from tensorflow.python.training import queue_runner_impl
label_desc: Use image node_id 7 for calling the QueueRunnerTest obj's underlying member method code with example usage: obj.testGracePeriod() without return types