code: def empty_replacement(self, aug):
      text = (
          '"Does what it says on the tin! No messing about, quick, easy and exactly as promised. '
          "Couldn't fault them.\""
      )
  
      texts = [self.text, text]
  
      augmented_data = aug.augment(text)
      self.assertNotEqual(text, augmented_data)
  
      augmented_data = aug.augment(texts)
      for augmented_text, orig_text in zip(augmented_data, texts):
          self.assertNotEqual(orig_text, augmented_text)
  
imports: import unittest
  import os
  from dotenv import load_dotenv
  import torch
  import nlpaug.augmenter.word
  import nlpaug.model.lang_models
label_desc: Use image node_id 19 for calling the TestContextualWordEmbsAug obj's underlying member method code with example usage: obj.empty_replacement(aug) without return types