code: def test_special_tokens_unaffacted_by_save_load(self):
      tmpdirname = tempfile.mkdtemp()
      original_special_tokens = self.tokenizer.fairseq_tokens_to_ids
      self.tokenizer.save_pretrained(tmpdirname)
      new_tok = MBartTokenizer.from_pretrained(tmpdirname)
      self.assertDictEqual(
          new_tok.fairseq_tokens_to_ids, original_special_tokens
      )
  
imports: import shutil
  import tempfile
  import unittest
  from transformers import SPIECE_UNDERLINE, BatchEncoding, MBartTokenizer, MBartTokenizerFast, is_torch_available
  from transformers.testing_utils import get_tests_dir, nested_simplify, require_sentencepiece, require_tokenizers, require_torch
  from ...test_tokenization_common import TokenizerTesterMixin
label_desc: Use image node_id 7 for calling the MBartEnroIntegrationTest obj's underlying member method code with example usage: obj.test_special_tokens_unaffacted_by_save_load() without return types