code: def test_unimplemented_dxgi_format():
      with pytest.raises(NotImplementedError):
          with Image.open("Tests/images/unimplemented_dxgi_format.dds"):
              pass
  
imports: from io import BytesIO
  import pytest
  from PIL import DdsImagePlugin, Image
  from .helper import assert_image_equal, assert_image_equal_tofile, hopper
label_desc: Use image node_id 9 for calling a global function with example usage: test_unimplemented_dxgi_format() without return types