code: def test_pickle():
      """
      several users have asked that the BO object be 'pickalable'
      This tests that this is the case
      """
      optimizer = BayesianOptimization(
          f=None,
          pbounds={"x": (-10, 10)},
          verbose=2,
          random_state=1,
      )
      with open("test_dump.obj", "wb") as filehandler:
          pickle.dump(optimizer, filehandler)
      os.remove("test_dump.obj")
  
imports: import pytest
  import numpy
  from bayes_opt import UtilityFunction
  from bayes_opt import BayesianOptimization
  from bayes_opt.logger import ScreenLogger
  from bayes_opt.event import Events, DEFAULT_EVENTS
  from bayes_opt.util import NotUniqueError
  import pickle
  import os
label_desc: Use image node_id 17 for calling a global function with example usage: test_pickle() without return types