message: modify test base for assert_cardinality_dataset
diff: # See the License for the specific language governing permissions and
  # limitations under the License.
  # ==============================================================================
  -"""Tests for the AssertCardinalityDataset serialization."""
  +"""Tests for checkpointing the AssertCardinalityDataset."""
  from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  -from tensorflow.python.data.experimental.kernel_tests.serialization import dataset_serialization_test_base
  from tensorflow.python.data.experimental.ops import cardinality
  +from tensorflow.python.data.kernel_tests import checkpoint_test_base
  from tensorflow.python.data.kernel_tests import test_base
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.framework import combinations
  from tensorflow.python.platform import test
  -class AssertCardinalityDatasetSerializationTest(
  - dataset_serialization_test_base.DatasetSerializationTestBase,
  +class AssertCardinalityCheckpointTest(
  + checkpoint_test_base.CheckpointTestBase,
  parameterized.TestCase):
  @combinations.generate(test_base.default_test_combinations())
  