code: def test_mask():
      with Image.open("Tests/images/hopper_mask.ico") as im:
          assert_image_equal_tofile(im, "Tests/images/hopper_mask.png")
  
file_path: pillow-simd/Tests/test_file_ico.py
imports: import io
  import pytest
  from PIL import IcoImagePlugin, Image, ImageDraw
  from .helper import assert_image_equal, assert_image_equal_tofile, hopper
label_desc: Use image node_id 2 for calling a global function with example usage: test_mask() without return types