code: def test_warnings(self):
      with self.assertWarns(RuntimeWarning):
          Phase(STFT(sample_file))
  
imports: from __future__ import absolute_import, division, print_function
  import sys
  import unittest
  from os.path import join
  from madmom.audio.spectrogram import Spectrogram
  from madmom.audio.stft import *
  from .None import AUDIO_PATH
label_desc: Use image node_id 4 for calling the PhaseClass obj's underlying member method code with example usage: obj.test_warnings() without return types