code: def setUpClass(cls):
      cls.tokenizer: MBartTokenizer = MBartTokenizer.from_pretrained(
          cls.checkpoint_name, src_lang="en_XX", tgt_lang="ro_RO"
      )
      cls.pad_token_id = 1
      return cls
  
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 1 for calling the MBartEnroIntegrationTest obj's underlying member method code with example usage: obj.setUpClass(cls) and returns: cls