code: def test_queue_balance(self):
      # We only test SimpleQueuePush because SimpleQueuePull doesn't gurantee
      # balance.
      inqueue = fiber.queues.SimpleQueuePush()
      outqueue = fiber.queues.SimpleQueuePush()
      num_workers = 4
      multiplier = 600
      workers = []
      results = []
      for i in range(num_workers):
          print("create worker", i)
          p = fiber.Process(
              target=worker, args=(inqueue, outqueue, i), daemon=True
          )
          workers.append(p)
      for i in range(num_workers):
          workers[i].start()
  
      # wait for all workers to connect
      time.sleep(1)
      for i in range(num_workers * multiplier):
          inqueue.put("work")
      for i in range(num_workers * multiplier):
          results.append(outqueue.get())
      stats = collections.Counter(results)
      total = num_workers * multiplier
      # send singals to all workers
      for i in range(num_workers * multiplier):
          inqueue.put("quit")
      for i in range(num_workers):
          workers[i].join()
      for i in range(num_workers):
          # print("{}: {} {:.2f}".format(i, stats[i], stats[i] / float(total)))
          # data should be fairly queued
          assert stats[i] == 600
  
imports: import fiber
  import pickle
  import time
  import pytest
  import docker
  import collections
  import multiprocessing
  from fiber.queues import Pipe, SimpleQueue
  from fiber.socket import Socket
label_desc: Use image node_id 15 for calling the TestQueue obj's underlying member method code with example usage: obj.test_queue_balance() without return types