code: def test_main_worker(trials):
      options = FakeOptions(
          max_jobs=1,
          # XXX: sync this with TempMongo
          mongo=as_mongo_str("localhost:22334/foodb"),
          reserve_timeout=1,
          poll_interval=0.5,
          workdir=None,
          exp_key="foo",
          last_job_timeout=None,
      )
      # -- check that it runs
      #    and that the reserve timeout is respected
      main_worker_helper(options, ())
  
imports: import pickle
  import os
  import signal
  import subprocess
  import sys
  import traceback
  import threading
  import time
  import unittest
  import numpy
  import nose
  import nose.plugins.skip
  from hyperopt.base import JOB_STATE_DONE, STATUS_OK
  from hyperopt.mongoexp import parse_url
  from hyperopt.mongoexp import MongoTrials
  from hyperopt.mongoexp import MongoWorker
  from hyperopt.mongoexp import ReserveTimeout
  from hyperopt.mongoexp import as_mongo_str
  from hyperopt.mongoexp import main_worker_helper
  from hyperopt.mongoexp import MongoJobs
  from hyperopt.fmin import fmin
  from hyperopt import hp, rand
  import hyperopt.tests.test_base
  from hyperopt.tests.unit.test_domains import gauss_wave2
label_desc: Use image node_id 15 for calling a global function with example usage: test_main_worker(trials) without return types