code: def test_ventilator_threads(self):
      self._test_simple_ventilation(lambda: ThreadPool(10))
  
imports: import time
  import unittest
  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 IdentityWorker
  from petastorm.workers_pool.thread_pool import ThreadPool
  from petastorm.workers_pool.ventilator import ConcurrentVentilator
label_desc: Use image node_id 3 for calling the TestWorkersPool obj's underlying member method code with example usage: obj.test_ventilator_threads() without return types