code: def test_acquisition_function(self):
      es = AcquisitionEntropySearch(
          self.model, self.space, MockSampler(self.space)
      )
      acquisition_value = es.acquisition_function(np.array([[1, 1]]))
  
      assert_allclose(acquisition_value, np.array([[-20.587977]]), 1e-5)
  
file_path: GPyOpt/GPyOpt/testing/acquisitions_tests/test_entropy_search_acquisition.py
imports: import unittest
  from mock import Mock
  import numpy
  from numpy.testing import assert_allclose
  import GPy
  from GPyOpt.acquisitions import AcquisitionEntropySearch
  from GPyOpt.core.task.space import Design_space
  from GPyOpt.models import GPModel
  from GPyOpt.util.mcmc_sampler import McmcSampler, AffineInvariantEnsembleSampler
  from GPyOpt.experiment_design import initial_design
label_desc: Use image node_id 2 for calling the TestEntropySearchAcquisition obj's underlying member method code with example usage: obj.test_acquisition_function() without return types