def METHOD_NAME():
    for test_file in test_files:
        with Image.open(test_file) as im:
            im_reloaded = roundtrip(im, save_all=True)
            im.seek(0)
            assert_image_similar(im, im_reloaded, 30)
            im.seek(1)
            im_reloaded.seek(1)
            assert_image_similar(im, im_reloaded, 30)
    im = Image.new("RGB", (1, 1))
    im2 = Image.new("RGB", (1, 1), "#f00")
    im_reloaded = roundtrip(im, save_all=True, append_images=[im2])
    assert_image_equal(im, im_reloaded)
    assert im_reloaded.mpinfo[45056] == b"0100"
    im_reloaded.seek(1)
    assert_image_similar(im2, im_reloaded, 1)
    # Test that a single frame image will not be saved as an MPO
    jpg = roundtrip(im, save_all=True)
    assert "mp" not in jpg.info