code: def test_empty_ventilation(self):
      pool = DummyPool()
      ventilator = ConcurrentVentilator(pool.ventilate, [])
      pool.start(IdentityWorker, ventilator=ventilator)
      with self.assertRaises(EmptyResultError):
          pool.get_results()
  
      pool.stop()
      pool.join()
  
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 8 for calling the TestWorkersPool obj's underlying member method code with example usage: obj.test_empty_ventilation() without return types