@Test
public void testAddStorageDirectoriesFailure() throws IOException {

  final int numLocations = 1;
  List<StorageLocation> locations = createStorageLocations(numLocations);
  assertEquals(numLocations, locations.size());
  NamespaceInfo namespaceInfo = new NamespaceInfo(0, CLUSTER_ID,
      DEFAULT_BPID, CTIME, BUILD_VERSION, SOFTWARE_VERSION);
  List<StorageDirectory> successLocations = storage.addStorageLocations(
      mockDN, namespaceInfo, locations, START_OPT);
  assertEquals(1, successLocations.size());
  // After the DataNode restarts, the value of the clusterId is different
  // from the value before the restart.
  storage.unlockAll();
  DataNode newMockDN = Mockito.mock(DataNode.class);
  Mockito.when(newMockDN.getConf()).thenReturn(new HdfsConfiguration());
  DataStorage newStorage = new DataStorage();
  NamespaceInfo newNamespaceInfo = new NamespaceInfo(0, CLUSTER_ID2,
      DEFAULT_BPID, CTIME, BUILD_VERSION, SOFTWARE_VERSION);
  successLocations = newStorage.addStorageLocations(
          newMockDN, newNamespaceInfo, locations, START_OPT);
  assertEquals(0, successLocations.size());
  newStorage.unlockAll();
  newMockDN.shutdown();
}