code: def test_photoimage_blank():
      # test a image using mode/size:
      for mode in TK_MODES:
          im_tk = ImageTk.PhotoImage(mode, (100, 100))
  
          assert im_tk.width() == 100
          assert im_tk.height() == 100
  
imports: import pytest
  from PIL import Image
  from .helper import assert_image_equal, hopper
label_desc: Use image node_id 4 for calling a global function with example usage: test_photoimage_blank() without return types