code: def testDatasetRecoversAndCompletes(self, num_workers):
      cluster = data_service_test_base.TestCluster(
          num_workers=num_workers
      )
      snapshot_dir = data_service_test_base.TempDir()
      dataset = dataset_ops.Dataset.range(1000)
      self.evaluate(
          distributed_save_op.distributed_save(
              dataset,
              snapshot_dir.full_path,
              cluster.dispatcher_address(),
              compression=None,
          )
      )
  
      for i in range(num_workers):
          cluster.stop_worker(i)
          cluster.restart_dispatcher()
          cluster.restart_worker(i)
      wait_for_snapshot(snapshot_dir.full_path)
      self.assertTrue(snapshot_is_done(snapshot_dir.full_path))
  
      dataset = dataset_ops.Dataset.load(snapshot_dir.full_path)
      self.assertDatasetProduces(
          dataset, range(1000), assert_items_equal=True
      )
  
imports: import collections
  import os
  import pathlib
  import time
  from absl.testing import parameterized
  from tensorflow.python.data.experimental.kernel_tests.service import test_base
  from tensorflow.python.data.experimental.ops import distributed_save_op
  from tensorflow.python.data.experimental.service import _pywrap_snapshot_utils
  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.framework import errors
  from tensorflow.python.platform import test
label_desc: Use image node_id 13 for calling the SnapshotFtTest obj's underlying member method code with example usage: obj.testDatasetRecoversAndCompletes(num_workers) without return types