code: def test_save():
      # Note that only individual frames can be saved at present
      for test_file in test_files:
          with Image.open(test_file) as im:
              assert im.tell() == 0
              jpg0 = frame_roundtrip(im)
              assert_image_similar(im, jpg0, 30)
              im.seek(1)
              assert im.tell() == 1
              jpg1 = frame_roundtrip(im)
              assert_image_similar(im, jpg1, 30)
  
imports: from io import BytesIO
  import pytest
  from PIL import Image
  from .helper import assert_image_similar, is_pypy, skip_unless_feature
label_desc: Use image node_id 19 for calling a global function with example usage: test_save() without return types