code: def test_file_handle(self):
      # open file handle
      with open(sample_file, "rb") as file_handle:
          signal, sample_rate = load_wave_file(file_handle)
      self.assertIsInstance(signal, np.ndarray)
      self.assertTrue(signal.dtype == np.int16)
      self.assertTrue(type(sample_rate) == int)
  
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 2 for calling the TestLoadWaveFileFunction obj's underlying member method code with example usage: obj.test_file_handle() without return types