code: def test_invalid_file():
      invalid_file = "Tests/images/flower.jpg"
  
      with pytest.raises(UnidentifiedImageError):
          GdImageFile.open(invalid_file)
  
imports: import pytest
  from PIL import GdImageFile, UnidentifiedImageError
label_desc: Use image node_id 3 for calling a global function with example usage: test_invalid_file() without return types