code: def test_pickle_mecab_tokenizer(self):
      tokenizer = self.tokenizer_class(
          self.vocab_file, word_tokenizer_type="mecab"
      )
      self.assertIsNotNone(tokenizer)
  
      text = "こんにちは、世界。\nこんばんは、世界。"
      tokens = tokenizer.tokenize(text)
      self.assertListEqual(
          tokens,
          ["こんにちは", "、", "世界", "。", "こん", "##ばんは", "、", "世界", "。"],
      )
      self.assertListEqual(
          tokenizer.convert_tokens_to_ids(tokens),
          [3, 12, 10, 14, 4, 9, 12, 10, 14],
      )
  
      filename = os.path.join(self.tmpdirname, "tokenizer.bin")
      with open(filename, "wb") as handle:
          pickle.dump(tokenizer, handle)
  
      with open(filename, "rb") as handle:
          tokenizer_new = pickle.load(handle)
  
      tokens_loaded = tokenizer_new.tokenize(text)
  
      self.assertListEqual(tokens, tokens_loaded)
  
imports: import os
  import pickle
  import unittest
  from transformers import AutoTokenizer
  from transformers.models.bert.tokenization_bert import BertTokenizer
  from transformers.models.bert_japanese.tokenization_bert_japanese import VOCAB_FILES_NAMES, BertJapaneseTokenizer, CharacterTokenizer, JumanppTokenizer, MecabTokenizer, SudachiTokenizer, WordpieceTokenizer
  from transformers.testing_utils import custom_tokenizers, require_jumanpp, require_sudachi
  from ...test_tokenization_common import TokenizerTesterMixin
label_desc: Use image node_id 8 for calling the BertJapaneseTokenizationTest obj's underlying member method code with example usage: obj.test_pickle_mecab_tokenizer() without return types