code: def test_exact_match(self):
      texts = ["Dear NLP, Thanks. Regards NLPAug"]
  
      reserved_tokens = [["Best Regards", "Sincerely", "Regard"]]
      aug = naw.ReservedAug(reserved_tokens=reserved_tokens)
      for text in texts:
          augmented_data = aug.augment(text)
          augmented_text = augmented_data[0]
  
          self.assertEqual(augmented_text, text)
  
      reserved_tokens = [["Regards", "Sincerely", "Regard"]]
      aug = naw.ReservedAug(reserved_tokens=reserved_tokens)
      for text in texts:
          augmented_data = aug.augment(text)
          augmented_text = augmented_data[0]
  
          self.assertNotEqual(augmented_text, text)
  
file_path: nlpaug/test/augmenter/word/test_reserved.py
imports: import unittest
  import nlpaug.augmenter.word
label_desc: Use image node_id 4 for calling the TestReserved obj's underlying member method code with example usage: obj.test_exact_match() without return types