code: def test_unsupported_conversion():
      im = hopper()
      with pytest.raises(ValueError):
          im.convert("INVALID")
  
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 2 for calling a global function with example usage: test_unsupported_conversion() without return types