code: def _test_image(self):
      im = hopper("RGB")
      return im.crop((10, 20, im.width - 10, im.height - 20))
  
imports: import math
  import pytest
  from PIL import Image, ImageTransform
  from .helper import assert_image_equal, assert_image_similar, hopper
label_desc: Use image node_id 1 for calling the TestImageTransformAffine obj's underlying member method code with example usage: obj._test_image() and returns: im