### Question:
RollupService implements Runnable, RollupServiceMBean { public synchronized void setRollupConcurrency(int i) { rollupReadExecutors.setCorePoolSize(i); rollupReadExecutors.setMaximumPoolSize(i); } RollupService(ScheduleContext context); @VisibleForTesting  RollupService(ScheduleContext context,
                         ShardStateManager shardStateManager,
                         ThreadPoolExecutor locatorFetchExecutors,
                         ThreadPoolExecutor rollupReadExecutors,
                         ThreadPoolExecutor rollupWriteExecutors,
                         long rollupDelayMillis,
                         long rollupDelayForMetricsWithShortDelay,
                         long rollupWaitForMetricsWithLongDelay,
                         long pollerPeriod,
                         long configRefreshInterval); void initializeGauges(); void forcePoll(); void run(); synchronized void setServerTime(long millis); synchronized long getServerTime(); synchronized void setKeepingServerTime(boolean b); synchronized boolean getKeepingServerTime(); synchronized void setPollerPeriod(long l); synchronized long getPollerPeriod(); synchronized int getScheduledSlotCheckCount(); synchronized int getSecondsSinceLastSlotCheck(); synchronized int getSlotCheckConcurrency(); synchronized void setSlotCheckConcurrency(int i); synchronized int getRollupConcurrency(); synchronized void setRollupConcurrency(int i); synchronized int getQueuedRollupCount(); synchronized int getInFlightRollupCount(); synchronized boolean getActive(); synchronized void setActive(boolean b); void addShard(Integer shard); void removeShard(Integer shard); Collection<Integer> getManagedShards(); synchronized Collection<Integer> getRecentlyScheduledShards(); synchronized Collection<String> getOldestUnrolledSlotPerGranularity(int shard);  }### Answer:
@Test public void testSetRollupConcurrency() { service.setRollupConcurrency(3); verify(rollupReadExecutors).setCorePoolSize(anyInt()); verify(rollupReadExecutors).setMaximumPoolSize(anyInt()); verifyNoMoreInteractions(rollupReadExecutors); }