code: def test_16bit_jp2_roundtrips():
      with Image.open("Tests/images/16bit.cropped.jp2") as jp2:
          im = roundtrip(jp2)
          assert_image_equal(im, jp2)
  
imports: import os
  import re
  from io import BytesIO
  import pytest
  from PIL import Image, ImageFile, Jpeg2KImagePlugin, UnidentifiedImageError, features
  from .helper import assert_image_equal, assert_image_similar, assert_image_similar_tofile, skip_unless_feature
label_desc: Use image node_id 28 for calling a global function with example usage: test_16bit_jp2_roundtrips() without return types