code: def test_tokens_to_indices_produces_correct_characters(self):
      vocab = Vocabulary()
      vocab.add_token_to_namespace("A", namespace="characters")
      vocab.add_token_to_namespace("s", namespace="characters")
      vocab.add_token_to_namespace("e", namespace="characters")
      vocab.add_token_to_namespace("n", namespace="characters")
      vocab.add_token_to_namespace("t", namespace="characters")
      vocab.add_token_to_namespace("c", namespace="characters")
  
      indexer = TokenCharactersIndexer(
          "characters", min_padding_length=1
      )
      indices = indexer.tokens_to_indices([Token("sentential")], vocab)
      assert indices == {
          "token_characters": [[3, 4, 5, 6, 4, 5, 6, 1, 1, 1]]
      }
  
file_path: allennlp/tests/data/token_indexers/character_token_indexer_test.py
imports: from collections import defaultdict
  import pytest
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data import Token, Vocabulary
  from allennlp.data.token_indexers import TokenCharactersIndexer
  from allennlp.data.tokenizers.character_tokenizer import CharacterTokenizer
label_desc: Use image node_id 3 for calling the CharacterTokenIndexerTest obj's underlying member method code with example usage: obj.test_tokens_to_indices_produces_correct_characters() without return types