code: def test_image_mask_LA(self, mode):
      im = Image.new(mode, (200, 200), "white")
      im2 = getattr(self, "gradient_" + mode)
  
      self.assert_9points_paste(
          im,
          im2,
          self.gradient_LA,
          [
              (128, 191, 255, 191),
              (112, 207, 206, 111),
              (128, 254, 128, 1),
              (208, 208, 239, 239),
              (192, 191, 191, 191),
              (207, 207, 112, 113),
              (255, 255, 255, 255),
              (239, 207, 207, 239),
              (255, 191, 128, 191),
          ],
      )
  
imports: from __future__ import annotations
  import pytest
  from PIL import Image
  from .helper import CachedProperty, assert_image_equal
label_desc: Use image node_id 13 for calling the TestImagingPaste obj's underlying member method code with example usage: obj.test_image_mask_LA(mode) without return types