code: def test_palette(mode):
      im = hopper(mode)
  
      # Expand
      expanded_im = ImageOps.expand(im)
      assert_image_equal(im.convert("RGB"), expanded_im.convert("RGB"))
  
      # Pad
      padded_im = ImageOps.pad(im, (256, 128), centering=(0, 0))
      assert_image_equal(
          im.convert("RGB"),
          padded_im.convert("RGB").crop((0, 0, 128, 128)),
      )
  
imports: from __future__ import annotations
  import pytest
  from PIL import Image, ImageDraw, ImageOps, ImageStat, features
  from .helper import assert_image_equal, assert_image_similar, assert_image_similar_tofile, assert_tuple_approx_equal, hopper
label_desc: Use image node_id 9 for calling a global function with example usage: test_palette(mode) without return types