code: def test_zero_comment_subblocks():
      with Image.open(
          "Tests/images/hopper_zero_comment_subblocks.gif"
      ) as im:
          assert_image_equal_tofile(im, TEST_GIF)
  
imports: from io import BytesIO
  import pytest
  from PIL import GifImagePlugin, Image, ImageDraw, ImagePalette, features
  from .helper import assert_image_equal, assert_image_equal_tofile, assert_image_similar, hopper, is_pypy, netpbm_available
label_desc: Use image node_id 46 for calling a global function with example usage: test_zero_comment_subblocks() without return types