code: def test_read_from_file(self, keep_sentences):
      reader = BabiReader(keep_sentences=keep_sentences)
      instances = list(
          reader.read(
              AllenNlpTestCase.FIXTURES_ROOT / "data" / "babi.txt"
          )
      )
      assert len(instances) == 8
  
      if keep_sentences:
          assert [
              t.text
              for t in instances[0].fields["context"][3].tokens[3:]
          ] == [
              "of",
              "wolves",
              ".",
          ]
          assert [
              t.sequence_index for t in instances[0].fields["supports"]
          ] == [0, 1]
      else:
          assert [
              t.text for t in instances[0].fields["context"].tokens[7:9]
          ] == ["afraid", "of"]
  
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 1 for calling the TestBAbIReader obj's underlying member method code with example usage: obj.test_read_from_file(keep_sentences) without return types