code: def test_bert_next_sentence_prediction_inputs(self):
      stream = tf_inputs.BertNextSentencePredictionInputs(
          "c4/en:2.3.0", data_dir=_TESTDATA, train=False, shuffle_size=1
      )
      exp_sent1 = "Police were called to the carriageway around 6."
      exp_sent2 = (
          "I am sorry we did not see how lost and alone you felt."
      )
      sent1, sent2, label = next(stream())
      self.assertEqual(exp_sent1, sent1)
      self.assertEqual(exp_sent2, sent2)
      self.assertFalse(label)
  
imports: import collections
  import os
  from unittest import mock
  import gin
  import numpy
  from t5.data import assert_dataset
  from t5.data import preprocessors
  import tensorflow
  import tensorflow_datasets
  from trax.data import inputs
  from trax.data import tf_inputs
label_desc: Use image node_id 25 for calling the TFInputsTest obj's underlying member method code with example usage: obj.test_bert_next_sentence_prediction_inputs() without return types