code: def test_rotate_90_deg(self):
      self._test_rotate(90, Image.ROTATE_90)
  
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 4 for calling the TestImageTransformAffine obj's underlying member method code with example usage: obj.test_rotate_90_deg() without return types