code: def test_8bit():
      with Image.open("Tests/images/hopper.jpg") as im:
          _test_float_conversion(im.convert("L"))
  
imports: from __future__ import annotations
  import pytest
  from PIL import Image
  from .helper import assert_image, assert_image_equal, assert_image_similar, hopper
label_desc: Use image node_id 5 for calling a global function with example usage: test_8bit() without return types