code: def setUp(self):
      super().setUp()
  
      # We have a SentencePiece fixture for testing
      tokenizer = PegasusTokenizer(SAMPLE_VOCAB)
      tokenizer.save_pretrained(self.tmpdirname)
  
imports: import unittest
  from transformers import PegasusTokenizer, PegasusTokenizerFast
  from transformers.testing_utils import get_tests_dir, require_sentencepiece, require_tokenizers, require_torch, slow
  from transformers.utils import cached_property
  from ...test_tokenization_common import TokenizerTesterMixin
label_desc: Use image node_id 1 for calling the PegasusTokenizationTest obj's underlying member method code with example usage: obj.setUp() without return types