code: def test_all_combination(self):
      texts = [
          "Dear NLP, text, texttt Thanks. best regards NLPAug",
          "Dear Natural Language Processing, text, texttt Thanks, regards NLPAug",
      ]
      reserved_tokens = [
          [
              "Best Regards",
              "Best Regards2222",
              "Best Regards3333",
              "Best Regards4444",
          ],
          ["thx", "Thanks", "thank you"],
          ["Dear", "Hi", "Hello"],
      ]
      aug = naw.ReservedAug(
          aug_p=1,
          generate_all_combinations=True,
          reserved_tokens=reserved_tokens,
          case_sensitive=False,
      )
  
      augmented_texts = aug.augment(texts)
      assert len(augmented_texts[0]) == 35
      assert len(augmented_texts[1]) == 8
  
file_path: nlpaug/test/augmenter/word/test_reserved.py
imports: import unittest
  import nlpaug.augmenter.word
label_desc: Use image node_id 8 for calling the TestReserved obj's underlying member method code with example usage: obj.test_all_combination() without return types