code: def test_slice_keys_multiple_name(self):
      if self.iterable is np.array:
          self.skipTest("ndarray of strings is not supported")
      dataset = self.dataset.slice[:, self.iterable(("item0", "item2"))]
      self.assertIsInstance(dataset, SliceableDataset)
      self.assertEqual(len(dataset), len(self.dataset))
      self.assertEqual(dataset.keys, ("item0", "item2"))
      self.assertEqual(dataset[3], ("item0(3)", "item2(3)"))
  
imports: import numpy
  import six
  import unittest
  from chainercv.chainer_experimental.datasets.sliceable import SliceableDataset
  from chainercv.utils import testing
label_desc: Use image node_id 7 for calling the TestSliceableDataset obj's underlying member method code with example usage: obj.test_slice_keys_multiple_name() without return types