code: def test_unclosed_file():
      def open():
          im = Image.open(test_files[0])
          im.load()
  
      pytest.warns(ResourceWarning, open)
  
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 3 for calling a global function with example usage: test_unclosed_file() without return types