code: def test_color_mask_L(self):
      for mode in ("RGBA", "RGB", "L"):
          im = getattr(self, "gradient_" + mode).copy()
          color = "white"
  
          self.assert_9points_paste(
              im,
              color,
              self.mask_L,
              [
                  (127, 191, 254, 191),
                  (111, 207, 206, 110),
                  (127, 254, 127, 0),
                  (207, 207, 239, 239),
                  (191, 191, 190, 191),
                  (207, 206, 111, 112),
                  (254, 254, 254, 255),
                  (239, 206, 206, 238),
                  (254, 191, 127, 191),
              ],
          )
  
imports: from PIL import Image
  from .helper import assert_image_equal, cached_property
label_desc: Use image node_id 16 for calling the TestImagingPaste obj's underlying member method code with example usage: obj.test_color_mask_L() without return types