code: def test_invalid_file():
      invalid_file = "Tests/images/flower.jpg"
  
      with pytest.raises(SyntaxError):
          GifImagePlugin.GifImageFile(invalid_file)
  
imports: from io import BytesIO
  import pytest
  from PIL import GifImagePlugin, Image, ImageDraw, ImagePalette, features
  from .helper import assert_image_equal, assert_image_equal_tofile, assert_image_similar, hopper, is_pypy, netpbm_available
label_desc: Use image node_id 5 for calling a global function with example usage: test_invalid_file() without return types