code: def test_rgba(ext):
      # Arrange
      with Image.open("Tests/images/rgb_trns_ycbc" + ext) as im:
          # Act
          im.load()
  
          # Assert
          assert im.mode == "RGBA"
  
imports: from __future__ import annotations
  import os
  import re
  from io import BytesIO
  import pytest
  from PIL import Image, ImageFile, Jpeg2KImagePlugin, UnidentifiedImageError, _binary, features
  from .helper import assert_image_equal, assert_image_similar, assert_image_similar_tofile, skip_unless_feature, skip_unless_feature_version
label_desc: Use image node_id 26 for calling a global function with example usage: test_rgba(ext) without return types