old_contents: import unittest
  
  from chainer import testing
  from chainer.testing import attr
  
  from chainercv.datasets import voc_semantic_segmentation_label_names
  from chainercv.datasets import VOCSemanticSegmentationDataset
  from chainercv.utils import assert_is_semantic_segmentation_dataset
  
  
  @testing.parameterize(
      {'split': 'train'},
      {'split': 'val'},
      {'split': 'trainval'}
  )
  class TestVOCSemanticSegmentationDataset(unittest.TestCase):
  
      def setUp(self):
          self.dataset = VOCSemanticSegmentationDataset(split=self.split)
  
      @attr.slow
      def test_camvid_dataset(self):
          assert_is_semantic_segmentation_dataset(
              self.dataset,
              len(voc_semantic_segmentation_label_names),
              n_example=10)
  
  
  testing.run_module(__name__, __file__)
  
new_contents: import unittest
  
  from chainer import testing
  from chainer.testing import attr
  
  from chainercv.datasets import voc_semantic_segmentation_label_names
  from chainercv.datasets import VOCSemanticSegmentationDataset
  from chainercv.utils import assert_is_semantic_segmentation_dataset
  
  
  @testing.parameterize(
      {'split': 'train'},
      {'split': 'val'},
      {'split': 'trainval'}
  )
  class TestVOCSemanticSegmentationDataset(unittest.TestCase):
  
      def setUp(self):
          self.dataset = VOCSemanticSegmentationDataset(split=self.split)
  
      @attr.slow
      def test_voc_semantic_segmentation_dataset(self):
          assert_is_semantic_segmentation_dataset(
              self.dataset,
              len(voc_semantic_segmentation_label_names),
              n_example=10)
  
  
  testing.run_module(__name__, __file__)
  
subject: fix test name