code: def setUp(self):
      super().setUp()
      self.test_dir = self.get_tempdir()
  
      # Write test wav file.
      self.wav_sr = 22050
      self.wav_secs = 0.5
      self.wav_path = os.path.join(self.test_dir, "test.wav")
      scipy.io.wavfile.write(
          self.wav_path,
          self.wav_sr,
          np.random.randint(
              np.iinfo(np.int16).min,
              np.iinfo(np.int16).max,
              size=int(self.wav_sr * self.wav_secs),
              dtype=np.int16,
          ),
      )
  
imports: import os
  import sys
  from absl import flags
  from absl.testing import absltest
  from absl.testing import parameterized
  from ddsp import spectral_ops
  from ddsp.training.data_preparation import prepare_tfrecord_lib
  import numpy
  import scipy.io.wavfile
  import tensorflow.compat.v2
label_desc: Use image node_id 2 for calling the PrepareTFRecordBeamTest obj's underlying member method code with example usage: obj.setUp() without return types