code: def test_librispeech_path(self):
      self.librispeech_cls._ext_audio = ".wav"
      dataset = self.librispeech_cls(Path(self.root_dir))
      self._test_librispeech(dataset)
  
file_path: audio/test/torchaudio_unittest/datasets/librispeech_test_impl.py
imports: import os
  from pathlib import Path
  from torchaudio.datasets import librispeech
  from torchaudio_unittest.common_utils import get_whitenoise, normalize_wav, save_wav, TempDirMixin
label_desc: Use image node_id 5 for calling the LibriSpeechTestMixin obj's underlying member method code with example usage: obj.test_librispeech_path() without return types