code: def test_target_mode(self):
      source = ImageFilter.Color3DLUT.generate(
          2, lambda r, g, b: (r, g, b), target_mode="HSV"
      )
  
      lut = source.transform(lambda r, g, b: (r, g, b))
      assert lut.mode == "HSV"
  
      lut = source.transform(
          lambda r, g, b: (r, g, b), target_mode="RGB"
      )
      assert lut.mode == "RGB"
  
imports: from __future__ import annotations
  from array import array
  import pytest
  from PIL import Image, ImageFilter
  from .helper import assert_image_equal
label_desc: Use image node_id 2 for calling the TestTransformColorLut3D obj's underlying member method code with example usage: obj.test_target_mode() without return types