code: def setUpClass(cls):
      cls.maxDiff = None
      config = AudioAugConfig()
  
      for i in range(len(config.input_files)):
          audio_path, audio_file = config.get_input_path(i)
          local_audio_path = pathmgr.get_local_path(audio_path)
          audio, sample_rate = librosa.load(
              local_audio_path, sr=None, mono=False
          )
  
          cls.audios.append(audio)
          cls.sample_rates.append(sample_rate)
          cls.local_audio_paths.append(local_audio_path)
  
file_path: AugLy/augly/tests/audio_tests/base_unit_test.py
imports: import os
  import tempfile
  import unittest
  from typing import Callable
  import numpy
  from augly.tests import AudioAugConfig
  from augly.utils import pathmgr, TEST_URI
  from augly.utils.libsndfile import install_libsndfile
  import librosa
  import soundfile
label_desc: Use image node_id 2 for calling the BaseAudioUnitTest obj's underlying member method code with example usage: obj.setUpClass(cls) without return types