code: def test_unknown_pattern():
      with pytest.raises(Exception):
          ImageMorph.LutBuilder(op_name="unknown")
  
imports: from __future__ import annotations
  import pytest
  from PIL import Image, ImageMorph, _imagingmorph
  from .helper import assert_image_equal_tofile, hopper
label_desc: Use image node_id 17 for calling a global function with example usage: test_unknown_pattern() without return types