code: def test_acquisition_function(self):
      self.mock_model.predict.return_value = (
          [1, 2, 3, 4],
          [1, 0.5, 0, 2],
      )
  
      weighted_acquisition = (
          self.lcb_mcmc_acquisition.acquisition_function(
              np.array([2, 2])
          )
      )
  
      self.assertTrue(
          np.array_equal(
              np.array([[0.75], [0.75]]), weighted_acquisition
          )
      )
  
file_path: GPyOpt/GPyOpt/testing/acquisitions_tests/test_lcb_mcmc_acquisition.py
imports: import unittest
  from mock import Mock
  import numpy
  from GPyOpt.acquisitions import AcquisitionLCB_MCMC
  from GPyOpt.core.task.space import Design_space
label_desc: Use image node_id 2 for calling the TestLCBmcmcAcquisition obj's underlying member method code with example usage: obj.test_acquisition_function() without return types