code: def testMultipleDatasetRecoversAndCompletes(self):
      cluster = data_service_test_base.TestCluster(num_workers=3)
      dataset1 = dataset_ops.Dataset.range(1000)
      datasets = [
          dataset_ops.Dataset.from_tensors("a").repeat(50),
          dataset_ops.Dataset.from_tensors("b").repeat(50),
          dataset_ops.Dataset.from_tensors("c").repeat(50),
      ]
      choice_dataset = dataset_ops.Dataset.range(3).repeat()
      dataset2 = dataset_ops.Dataset.choose_from_datasets(
          datasets, choice_dataset
      )
  
      snapshot_path1 = os.path.join(self._path, "snapshot1")
      snapshot_path2 = os.path.join(self._path, "snapshot2")
      self.evaluate(
          distributed_save_op.distributed_save(
              dataset1, snapshot_path1, cluster.dispatcher_address()
          )
      )
      self.evaluate(
          distributed_save_op.distributed_save(
              dataset2, snapshot_path2, cluster.dispatcher_address()
          )
      )
  
      # Blocks until all workers have streams.
      get_stream_assignments(
          cluster, 3, [snapshot_path1, snapshot_path2]
      )
      cluster.stop_worker(0)
      cluster.restart_dispatcher()
      cluster.restart_worker(0)
      while not os.path.exists(os.path.join(snapshot_path1, "DONE")):
          time.sleep(0.1)
      while not os.path.exists(os.path.join(snapshot_path2, "DONE")):
          time.sleep(0.1)
  
imports: import collections
  import os
  import pathlib
  import shutil
  import tempfile
  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.data.ops import test_mode
  from tensorflow.python.framework import combinations
  from tensorflow.python.framework import errors
  from tensorflow.python.platform import test
label_desc: Use image node_id 23 for calling the SnapshotFtTest obj's underlying member method code with example usage: obj.testMultipleDatasetRecoversAndCompletes() without return types