code: def setUp(self):
      self.vocab = Vocabulary()
      self.vocab.add_token_to_namespace("sentence", namespace="words")
      self.vocab.add_token_to_namespace("A", namespace="words")
      self.vocab.add_token_to_namespace("A", namespace="characters")
      self.vocab.add_token_to_namespace("s", namespace="characters")
      self.vocab.add_token_to_namespace("e", namespace="characters")
      self.vocab.add_token_to_namespace("n", namespace="characters")
      self.vocab.add_token_to_namespace("t", namespace="characters")
      self.vocab.add_token_to_namespace("c", namespace="characters")
      super(TestTextField, self).setUp()
  
imports: from __future__ import with_statement
  from __future__ import absolute_import
  from __future__ import print_function
  from collections import defaultdict
  import pytest
  import numpy
  from allennlp.data import Token, Vocabulary
  from allennlp.data.fields import TextField
  from allennlp.data.token_indexers import SingleIdTokenIndexer, TokenCharactersIndexer, TokenIndexer
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.common.checks import ConfigurationError
  from allennlp.common.util import pad_sequence_to_length
label_desc: Use image node_id 1 for calling the TestTextField obj's underlying member method code with example usage: obj.setUp() without return types