code: def test_recursive_dir(self):
      from scipy.io import wavfile
  
      with TempDirectory() as temp_dir:
          file1 = temp_dir + "/1.wav"
          mkdir(temp_dir + "/foo")
          file2 = temp_dir + "/foo/2.wav"
          wavfile.write(file1, self.sample_rate1, self.noise1)
          wavfile.write(file2, self.sample_rate2, self.noise2)
  
          sf = tc.load_audio(temp_dir)
  
          self._assert_audio_sframe_correct(sf, file1, file2)
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  from .util import TempDirectory
  from copy import copy
  import math
  from os import mkdir
  import unittest
  import pytest
  import numpy
  import sys
  import turicreate
  from turicreate.toolkits._internal_utils import _raise_error_if_not_sarray
  from turicreate.toolkits._main import ToolkitError
  from turicreate.toolkits._internal_utils import _mac_ver
label_desc: Use image node_id 3 for calling the ReadAudioTest obj's underlying member method code with example usage: obj.test_recursive_dir() without return types