code: def test_no_namespace_means_no_indexing(self):
      indexer = SingleIdTokenIndexer(
          namespace=None, feature_name="text_id"
      )
      assert indexer.tokens_to_indices([Token(text_id=23)], None) == {
          "tokens": [23]
      }
  
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 8 for calling the TestSingleIdTokenIndexer obj's underlying member method code with example usage: obj.test_no_namespace_means_no_indexing() without return types