code: def test_delegate_dataset(self):
      dataset = tabular.DelegateDataset(
          dummy_dataset.DummyDataset(mode=self.mode)
      )
  
      self.assertIsInstance(dataset, chainer.dataset.TabularDataset)
      self.assertEqual(len(dataset), len(dataset.dataset))
      self.assertEqual(dataset.keys, dataset.dataset.keys)
      self.assertEqual(dataset.mode, dataset.dataset.mode)
      self.assertEqual(
          dataset.get_example(3), dataset.dataset.get_example(3)
      )
  
file_path: chainer/tests/chainer_tests/dataset_tests/tabular_tests/test_delegate_dataset.py
imports: import unittest
  import chainer
  from chainer.dataset import tabular
  from chainer import testing
  from chainer_tests.dataset_tests.tabular_tests import dummy_dataset
label_desc: Use image node_id 1 for calling the TestDelegateDataset obj's underlying member method code with example usage: obj.test_delegate_dataset() without return types