### Question:
CacheInfoManager extends AbstractService implements ICacheInfoManager, PageChangedObserver { @Override public void flushGroup(String targetCache, String group) { String[] groups = {group}; this.accessOnGroupMapping(targetCache, -1, groups, null); }  @Override void init(); @Around("@annotation(cacheableInfo)") Object aroundCacheableMethod(ProceedingJoinPoint pjp, CacheableInfo cacheableInfo); @Around("@annotation(cacheInfoEvict)") Object aroundCacheInfoEvictMethod(ProceedingJoinPoint pjp, CacheInfoEvict cacheInfoEvict); void setExpirationTime(String targetCache, String key, int expiresInMinute); void setExpirationTime(String targetCache, String key, long expiresInSeconds); void setExpirationTime(String targetCache, String key, Date expirationTime); @Override void updateFromPageChanged(PageChangedEvent event); @Override void destroy(); void flushAll(); void flushAll(String cacheName); @Override void flushEntry(String targetCache, String key); void putInCache(String targetCache, String key, Object obj); void putInCache(String targetCache, String key, Object obj, String[] groups); @Override void putInGroup(String targetCache, String key, String[] groups); @Override void flushGroup(String targetCache, String group); @Override boolean isExpired(String targetCache, String key); Object getFromCache(String targetCache, String key); void setSpringCacheManager(CacheManager springCacheManager);  }### Answer:
@Test public void flushGroup_1() { this.flushGroup("group_1", 3); }
@Test public void flushGroup_2() { this.flushGroup("group_2", 4); }