code: def test_values(self):
      # test wave loader
      self.assertTrue(np.allclose(self.signal, self.result))
      self.assertTrue(self.result.sample_rate == 44100)
      self.assertTrue(self.result.shape == (123481,))
  
imports: from __future__ import absolute_import, division, print_function
  import io
  import unittest
  from os.path import join
  from madmom.io.audio import *
  from .None import AUDIO_PATH, DATA_PATH
label_desc: Use image node_id 3 for calling the TestWriteWaveFileFunction obj's underlying member method code with example usage: obj.test_values() without return types