code: def test_load_dxt1():
      with Image.open("Tests/images/ftex_dxt1.ftc") as im:
          with Image.open("Tests/images/ftex_dxt1.png") as target:
              assert_image_similar(im, target.convert("RGBA"), 15)
  
imports: from __future__ import annotations
  import pytest
  from PIL import FtexImagePlugin, Image
  from .helper import assert_image_equal_tofile, assert_image_similar
label_desc: Use image node_id 2 for calling a global function with example usage: test_load_dxt1() without return types