code: def test_completed_prefetch_yieldsAllCompleteUpToSpecifiedLimit(
      self, rayWaitMock
  ):
      # Load the pool with 1000 tasks, mock them all as complete and then
      # check that the first call to completed_prefetch only yield 999 items
      # and the second call yields the final one
      pool = TaskPool()
      for i in range(1000):
          task = createMockWorkerAndObjectRef(i)
          pool.add(*task)
  
      rayWaitMock.return_value = (list(range(1000)), [])
  
      # Verify that only the first 500 tasks are returned, this should leave
      # some tasks in the _fetching deque for later
      fetched = [
          pair[1] for pair in pool.completed_prefetch(max_yield=500)
      ]
      self.assertListEqual(fetched, list(range(500)))
  
      # Finally, check the next iteration returns the remaining tasks
      fetched = [pair[1] for pair in pool.completed_prefetch()]
      self.assertListEqual(fetched, list(range(500, 1000)))
  
file_path: ray/python/ray/rllib/utils/tests/test_taskpool.py
imports: import unittest
  from unittest.mock import patch
  import ray
  from ray.rllib.utils.actors import TaskPool
label_desc: Use image node_id 3 for calling the TaskPoolTest obj's underlying member method code with example usage: obj.test_completed_prefetch_yieldsAllCompleteUpToSpecifiedLimit(rayWaitMock) without return types