code: def test_process(self):
      result = self.processor.process(sample_file)
      # attributes
      self.assertTrue(result.shape == (281, 1024))
      self.assertTrue(
          np.allclose(
              result.bin_frequencies, fft_frequencies(1024, 44100)
          )
      )
      self.assertIsInstance(result, ShortTimeFourierTransform)
      self.assertTrue(result.fft_size == 2048)
      self.assertTrue(
          np.allclose(result.fft_window, np.hanning(2048) / 32767)
      )
  
      # properties
      self.assertTrue(result.num_bins == 1024)
      self.assertTrue(result.num_frames == 281)
  
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 ShortTimeFourierTransformProcessorClass obj's underlying member method code with example usage: obj.test_process() without return types