code: def setUpClass(cls):
      cls.tokenizer: MBart50Tokenizer = (
          MBart50Tokenizer.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, MBart50Tokenizer, MBart50TokenizerFast, is_torch_available
  from transformers.testing_utils import get_tests_dir, nested_simplify, require_sentencepiece, require_tokenizers, require_torch, slow
  from ...test_tokenization_common import TokenizerTesterMixin
label_desc: Use image node_id 1 for calling the MBart50OneToManyIntegrationTest obj's underlying member method code with example usage: obj.setUpClass(cls) and returns: cls