code: def test_sanity():
      for test_file in test_files:
          with Image.open(test_file) as im:
              im.load()
              assert im.mode == "RGB"
              assert im.size == (640, 480)
              assert im.format == "MPO"
  
imports: from io import BytesIO
  import pytest
  from PIL import Image
  from .helper import assert_image_similar, is_pypy, skip_unless_feature
label_desc: Use image node_id 2 for calling a global function with example usage: test_sanity() without return types