code: def test_bbox(tmp_path):
      out = str(tmp_path / "temp.gif")
  
      im = Image.new("RGB", (100, 100), "#fff")
      ims = [Image.new("RGB", (100, 100), "#000")]
      im.save(out, save_all=True, append_images=ims)
  
      with Image.open(out) as reread:
          assert reread.n_frames == 2
  
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 51 for calling a global function with example usage: test_bbox(tmp_path) without return types