code: def testSaveWavFile(self):
      tmp_dir = self.get_temp_dir()
      file_path = os.path.join(tmp_dir, "load_test.wav")
      save_data = np.zeros([16000, 1])
      input_data.save_wav_file(file_path, save_data, 16000)
      loaded_data = input_data.load_wav_file(file_path)
      self.assertIsNotNone(loaded_data)
      self.assertEqual(16000, len(loaded_data))
  
imports: import os
  import numpy
  import tensorflow
  from tensorflow.examples.speech_commands import input_data
  from tensorflow.examples.speech_commands import models
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import test
label_desc: Use image node_id 13 for calling the InputDataTest obj's underlying member method code with example usage: obj.testSaveWavFile() without return types