code: def setup_method(self):
      self.vocab = Vocabulary()
      self.vocab.add_token_to_namespace("this")
      self.vocab.add_token_to_namespace("is")
      self.vocab.add_token_to_namespace("a")
      self.vocab.add_token_to_namespace("sentence")
      self.vocab.add_token_to_namespace(".")
      self.token_indexer = {"tokens": SingleIdTokenIndexer()}
      self.instances = self.get_instances()
      super().setup_method()
  
file_path: allennlp/tests/data/dataset_test.py
imports: import pytest
  import numpy
  from allennlp.common.checks import ConfigurationError
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data import Instance, Token, Vocabulary
  from allennlp.data.batch import Batch
  from allennlp.data.fields import TextField, LabelField
  from allennlp.data.token_indexers import SingleIdTokenIndexer
label_desc: Use image node_id 1 for calling the TestDataset obj's underlying member method code with example usage: obj.setup_method() without return types