code: def test_image_mask_RGBa(self):
      for mode in ("RGBA", "RGB", "L"):
          im = Image.new(mode, (200, 200), "white")
          im2 = getattr(self, "gradient_" + mode)
  
          self.assert_9points_paste(
              im,
              im2,
              self.gradient_RGBa,
              [
                  (128, 255, 126, 255),
                  (0, 127, 126, 255),
                  (126, 253, 126, 255),
                  (128, 127, 254, 255),
                  (0, 255, 254, 255),
                  (126, 125, 254, 255),
                  (128, 1, 128, 255),
                  (0, 129, 128, 255),
                  (126, 255, 128, 255),
              ],
          )
  
imports: from PIL import Image
  from .helper import assert_image_equal, cached_property
label_desc: Use image node_id 13 for calling the TestImagingPaste obj's underlying member method code with example usage: obj.test_image_mask_RGBa() without return types