code: def test_edge():
      # edge
      mop = ImageMorph.MorphOp(op_name="edge")
      count, Aout = mop.apply(A)
      assert count == 1
      assert_img_equal_img_string(
          Aout,
          """
                                       .......
                                       .......
                                       ..111..
                                       ..1.1..
                                       ..111..
                                       .......
                                       .......
                                       """,
      )
  
imports: import pytest
  from PIL import Image, ImageMorph, _imagingmorph
  from .helper import assert_image_equal_tofile, hopper
label_desc: Use image node_id 13 for calling a global function with example usage: test_edge() without return types