code: def testPrepareDataIndexMissing(self):
      tmp_dir = self.get_temp_dir()
      self._saveWavFolders(tmp_dir, ["a", "b", "c"], 100)
      with self.assertRaises(Exception) as e:
          _ = input_data.AudioProcessor(
              "",
              tmp_dir,
              10,
              10,
              ["a", "b", "d"],
              10,
              10,
              self._model_settings(),
              tmp_dir,
          )
      self.assertIn("Expected to find", str(e.exception))
  
imports: import os
  import numpy
  import tensorflow
  from tensorflow.examples.speech_commands import input_data
  from tensorflow.examples.speech_commands import models
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import test
label_desc: Use image node_id 10 for calling the InputDataTest obj's underlying member method code with example usage: obj.testPrepareDataIndexMissing() without return types