code: def test_slice(self):
      ds = self.ds
      self.assertEqual(ds[:], ds.values)
      self.assertEqual(ds[1:], ds.values[1:])
      self.assertEqual(ds[2:], ds.values[2:])
      self.assertEqual(ds[1:4], ds.values[1:4])
      self.assertEqual(ds[0:4], ds.values[0:4])
      self.assertEqual(ds[1:5], ds.values[1:5])
      self.assertEqual(ds[:-1], ds.values[:-1])
      self.assertEqual(ds[1:-2], ds.values[1:-2])
      self.assertEqual(ds[-4:-1], ds.values[-4:-1])
      self.assertEqual(ds[::-1], ds.values[::-1])
      self.assertEqual(ds[4::-1], ds.values[4::-1])
      self.assertEqual(ds[:2:-1], ds.values[:2:-1])
      self.assertEqual(ds[-1::-1], ds.values[-1::-1])
      self.assertEqual(ds[:-3:-1], ds.values[:-3:-1])
      self.assertEqual(ds[-1:-3:-1], ds.values[-1:-3:-1])
      self.assertEqual(ds[4:1:-1], ds.values[4:1:-1])
      self.assertEqual(ds[-1:1:-1], ds.values[-1:1:-1])
      self.assertEqual(ds[4:-3:-1], ds.values[4:-3:-1])
      self.assertEqual(ds[-2:-4:-1], ds.values[-2:-4:-1])
      self.assertEqual(ds[::2], ds.values[::2])
      self.assertEqual(ds[1::2], ds.values[1::2])
      self.assertEqual(ds[:3:2], ds.values[:3:2])
      self.assertEqual(ds[1:4:2], ds.values[1:4:2])
      self.assertEqual(ds[::-2], ds.values[::-2])
      self.assertEqual(ds[:10], ds.values[:10])
  
file_path: chainer/tests/chainer_tests/dataset_tests/test_dataset_mixin.py
imports: import unittest
  import numpy
  from chainer import dataset
  from chainer import testing
label_desc: Use image node_id 3 for calling the TestDatasetMixin obj's underlying member method code with example usage: obj.test_slice() without return types