code: def test_set_lut():
      # Arrange
      lb = ImageMorph.LutBuilder(op_name="corner")
      lut = lb.build_lut()
      mop = ImageMorph.MorphOp()
  
      # Act
      mop.set_lut(lut)
  
      # Assert
      assert mop.lut == lut
  
imports: import pytest
  from PIL import Image, ImageMorph, _imagingmorph
  from .helper import assert_image_equal_tofile, hopper
label_desc: Use image node_id 23 for calling a global function with example usage: test_set_lut() without return types