@Test
public void TestConvertDatanodeStorage() {

  DatanodeStorage dns1 = new DatanodeStorage(
      "id1", DatanodeStorage.State.NORMAL, StorageType.SSD);
  DatanodeStorageProto proto = PBHelperClient.convert(dns1);
  DatanodeStorage dns2 = PBHelperClient.convert(proto);
  compare(dns1, dns2);
}