code: def test_count_other_features(self):
      indexer = SingleIdTokenIndexer(
          "other_features", feature_name="is_bold"
      )
      counter = defaultdict(lambda: defaultdict(int))
      token = TokenWithStyle("Header")
      token.is_bold = "True"
      indexer.count_vocab_items(token, counter)
      assert counter["other_features"] == {"True": 1}
  
imports: from collections import defaultdict
  from dataclasses import dataclass
  import pytest
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data import Token, Vocabulary
  from allennlp.data.token_indexers import SingleIdTokenIndexer
  from allennlp.data.tokenizers import SpacyTokenizer
label_desc: Use image node_id 3 for calling the TestSingleIdTokenIndexer obj's underlying member method code with example usage: obj.test_count_other_features() without return types