code: def test_color_mask_RGBa(self):
      for mode in ("RGBA", "RGB", "L"):
          im = getattr(self, "gradient_" + mode).copy()
          color = "white"
  
          self.assert_9points_paste(
              im,
              color,
              self.gradient_RGBa,
              [
                  (255, 63, 126, 63),
                  (47, 143, 142, 46),
                  (126, 253, 126, 255),
                  (15, 15, 47, 47),
                  (63, 63, 62, 63),
                  (142, 141, 46, 47),
                  (255, 255, 255, 0),
                  (48, 15, 15, 47),
                  (126, 63, 255, 63),
              ],
          )
  
imports: from PIL import Image
  from .helper import assert_image_equal, cached_property
label_desc: Use image node_id 18 for calling the TestImagingPaste obj's underlying member method code with example usage: obj.test_color_mask_RGBa() without return types