code: def test_sanity():
      with GdImageFile.open(TEST_GD_FILE) as im:
          assert im.size == (128, 128)
          assert im.format == "GD"
  
imports: import pytest
  from PIL import GdImageFile, UnidentifiedImageError
label_desc: Use image node_id 1 for calling a global function with example usage: test_sanity() without return types