code: def test_save_rgb_single_transparency(self, tmp_path):
      in_file = "Tests/images/caption_6_33_22.png"
      with Image.open(in_file) as im:
          test_file = str(tmp_path / "temp.png")
          im.save(test_file)
  
imports: import re
  import sys
  import zlib
  from io import BytesIO
  import pytest
  from PIL import Image, ImageFile, PngImagePlugin, features
  from .helper import PillowLeakTestCase, assert_image, assert_image_equal, assert_image_equal_tofile, hopper, is_win32, mark_if_feature_version, skip_unless_feature
label_desc: Use image node_id 15 for calling the TestFilePng obj's underlying member method code with example usage: obj.test_save_rgb_single_transparency(tmp_path) without return types