code: def testLoadWavFile(self):
      tmp_dir = self.get_temp_dir()
      file_path = os.path.join(tmp_dir, "load_test.wav")
      wav_data = self._getWavData()
      self._saveTestWavFile(file_path, wav_data)
      sample_data = input_data.load_wav_file(file_path)
      self.assertIsNotNone(sample_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 12 for calling the InputDataTest obj's underlying member method code with example usage: obj.testLoadWavFile() without return types