code: def test_unclosed_file():
      def open():
          im = Image.open(test_files[0])
          im.load()
  
      with pytest.warns(ResourceWarning):
          open()
  
imports: from __future__ import annotations
  import warnings
  from io import BytesIO
  import pytest
  from PIL import Image
  from .helper import assert_image_equal, assert_image_similar, is_pypy, skip_unless_feature
label_desc: Use image node_id 3 for calling a global function with example usage: test_unclosed_file() without return types