code: def testPrepareWordsList(self):
      words_list = ["a", "b"]
      self.assertGreater(
          len(input_data.prepare_words_list(words_list)),
          len(words_list),
      )
  
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 6 for calling the InputDataTest obj's underlying member method code with example usage: obj.testPrepareWordsList() without return types