BackupStatusImpl implements BackupStatus, Serializable { @Override public Set<PersistentID> getOfflineDiskStores() { return offlineDiskStores; } BackupStatusImpl(Map<DistributedMember, Set<PersistentID>> backedUpDiskStores,
      Set<PersistentID> offlineDiskStores); @Override Map<DistributedMember, Set<PersistentID>> getBackedUpDiskStores(); @Override Set<PersistentID> getOfflineDiskStores(); @Override String toString();  }
@Test public void getOfflineDiskStores() { BackupStatus backupStatus = new BackupStatusImpl(backedUpDiskStores, offlineDiskStores); assertThat(backupStatus.getOfflineDiskStores()).isEqualTo(offlineDiskStores); }