code: def test_white():
      with Image.open("Tests/images/lab.tif") as i:
          i.load()
  
          assert i.mode == "LAB"
  
          assert i.getbands() == ("L", "A", "B")
  
          k = i.getpixel((0, 0))
  
          L = i.getdata(0)
          a = i.getdata(1)
          b = i.getdata(2)
  
      assert k == (255, 128, 128)
  
      assert list(L) == [255] * 100
      assert list(a) == [128] * 100
      assert list(b) == [128] * 100
  
imports: from __future__ import annotations
  from PIL import Image
label_desc: Use image node_id 1 for calling a global function with example usage: test_white() without return types