code: def test_binary_opening():
      footprint = morphology.square(3)
      binary_res = binary.binary_opening(bw_img, footprint)
      gray_res = img_as_bool(gray.opening(bw_img, footprint))
      assert_array_equal(binary_res, gray_res)
  
imports: import numpy
  import pytest
  from numpy.testing import assert_array_equal, assert_equal
  from scipy import ndimage
  from skimage import data, color, morphology
  from skimage.util import img_as_bool
  from skimage.morphology import binary, footprints, gray
label_desc: Use image node_id 6 for calling a global function with example usage: test_binary_opening() without return types