code: def get_ref_image(self, fname: str) -> Image.Image:
      ref_img_name = f"test_{fname}.png"
      ref_local_path = pathmgr.get_local_path(
          os.path.join(self.ref_img_dir, ref_img_name)
      )
      return Image.open(ref_local_path)
  
file_path: AugLy/augly/tests/image_tests/base_unit_test.py
imports: import os
  import tempfile
  import unittest
  from typing import Any, Callable, Dict, List, Optional
  import numpy
  from augly.tests import ImageAugConfig
  from augly.utils import pathmgr, TEST_URI
  from PIL import Image
label_desc: Use image node_id 5 for calling the BaseImageUnitTest obj's underlying member method code with example usage: obj.get_ref_image(fname) and returns: Image