code: def test_can_build_from_params(self):
      reader = BabiReader.from_params(Params({"keep_sentences": True}))
  
      assert reader._keep_sentences
      assert (
          reader._token_indexers["tokens"].__class__.__name__
          == "SingleIdTokenIndexer"
      )
  
imports: import pytest
  from allennlp.common import Params
  from allennlp.data.dataset_readers import BabiReader
  from allennlp.common.testing import AllenNlpTestCase
label_desc: Use image node_id 2 for calling the TestBAbIReader obj's underlying member method code with example usage: obj.test_can_build_from_params() without return types