### Question:
StatsManager { void shutdown() { if (statsAggregator != null) { statsAggregator.cancel(); } if (scheduler != null) { shutDownExecutorService(scheduler, 30, TimeUnit.SECONDS); } } StatsManager(StorageManager storageManager, List<? extends ReplicaId> replicaIds, MetricRegistry registry,
      StatsManagerConfig config, Time time, ClusterParticipant clusterParticipant);   }### Answer:
@Test public void testShutdownBeforeStart() { statsManager.shutdown(); }