code: def _get_audio_file_by_language(self, language, audio_file_name=None):
      if audio_file_name is None:
          audio_file_name = "%s.wav" % append_language(
              "multiple_keywords", language
          )
      return os.path.join(
          self._root_dir, "resources/audio_samples", audio_file_name
      )
  
file_path: porcupine/demo/c/test/test_porcupine_c.py
imports: import os.path
  import subprocess
  import sys
  import unittest
  from parameterized import parameterized
  from test_util import *
label_desc: Use image node_id 5 for calling the PorcupineCTestCase obj's underlying member method code with example usage: obj._get_audio_file_by_language(language, audio_file_name) and returns: os