code: def test_init_without_examples(self):
      dataset = lit_dataset.IndexedDataset(spec=self._DATASET_SPEC)
      self.assertEmpty(dataset.examples)
      self.assertEmpty(dataset.indexed_examples)
      self.assertEqual(dataset.spec(), self._DATASET_SPEC)
      self.assertIsNone(dataset.init_spec())
  
imports: import os
  import types
  from absl.testing import absltest
  from absl.testing import parameterized
  from lit_nlp.api import dataset
  from lit_nlp.api import types
  import numpy
label_desc: Use image node_id 7 for calling the IndexedDatasetTest obj's underlying member method code with example usage: obj.test_init_without_examples() without return types