code: def test_no_namespace_means_no_counting(self):
      tokenizer = SpacyTokenizer(parse=True)
      tokens = tokenizer.tokenize("This is a sentence.")
      tokens = [Token("<S>")] + [t for t in tokens] + [Token("</S>")]
      indexer = SingleIdTokenIndexer(
          namespace=None, feature_name="text_id"
      )
  
      def fail():
          assert False
  
      counter = defaultdict(fail)
      for token in tokens:
          indexer.count_vocab_items(token, counter)
  
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 7 for calling the TestSingleIdTokenIndexer obj's underlying member method code with example usage: obj.test_no_namespace_means_no_counting() without return types