code: def setUp(self):
      self.signal = Signal(sample_file)
      write_wave_file(self.signal, tmp_file)
      self.result = Signal(sample_file)
  
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 1 for calling the TestWriteWaveFileFunction obj's underlying member method code with example usage: obj.setUp() without return types