code: def test_duplicate_word(self):
      text = "Dear NLP, text, texttt Thanks. best regards NLPAug"
      reserved_tokens = [["Best Regards", "ABCD"], ["regards", "1234"]]
  
      aug = naw.ReservedAug(
          reserved_tokens=reserved_tokens, case_sensitive=False
      )
      augmented_data = aug.augment(text)
      augmented_text = augmented_data[0]
      self.assertTrue("ABCD" in augmented_text)
  
file_path: nlpaug/test/augmenter/word/test_reserved.py
imports: import unittest
  import nlpaug.augmenter.word
label_desc: Use image node_id 5 for calling the TestReserved obj's underlying member method code with example usage: obj.test_duplicate_word() without return types