code: def _create_test_dir(self):
      test_audio = np.random.uniform(size=[self.audio_len])
      temp_dir = tempfile.TemporaryDirectory()
      try:
          test_dir = Path(temp_dir.name)
          audio_path = test_dir / self.audio_filename
          sf.write(audio_path, test_audio, self.sample_rate)
          yield test_dir
      finally:
          temp_dir.cleanup()
  
imports: import contextlib
  import tempfile
  from pathlib import Path
  import numpy
  import pytest
  import soundfile
  import torch
  from nemo.collections.tts.parts.preprocessing.features import EnergyFeaturizer, MelSpectrogramFeaturizer, PitchFeaturizer
label_desc: Use image node_id 3 for calling the TestTTSFeatures obj's underlying member method code with example usage: obj._create_test_dir() without return types