docstr: Check edge case, when workers consistently does not produce results
docstr_tok: ["Check","edge","case",",","when","workers","consistently","does","not","produce","results"]
code: def test_worker_produces_some_results(self):
      """Check edge case, when workers consistently does not produce results"""
      # 10000 is an interesting case as in the original implementation it caused stack overflow
      VENTILATE_COUNT = 4
      for pool in [DummyPool(), ThreadPool(1)]:
          pool.start(PreprogrammedReturnValueWorker, [[], [], [42], []])
          for _ in range(VENTILATE_COUNT):
              pool.ventilate("not_important")
  
          self.assertEqual(42, pool.get_results())
          with self.assertRaises(EmptyResultError):
              pool.get_results()
  
          pool.stop()
          pool.join()
  
imports: import time
  import unittest
  import numpy
  from multiprocessing import Process, Manager
  from psutil import pid_exists
  from petastorm.workers_pool import EmptyResultError
  from petastorm.workers_pool.dummy_pool import DummyPool
  from petastorm.workers_pool.process_pool import ProcessPool
  from petastorm.workers_pool.tests.stub_workers import CoeffMultiplierWorker, WorkerIdGeneratingWorker, WorkerMultiIdGeneratingWorker, SleepyWorkerIdGeneratingWorker, ExceptionGeneratingWorker_5, PreprogrammedReturnValueWorker
  from petastorm.workers_pool.thread_pool import ThreadPool
label_desc: Use image node_id 23 for calling the TestWorkersPool obj's underlying member method code with example usage: obj.test_worker_produces_some_results() without return types