### Question:
PersistenceCacheManager { public static void addEntityToPersistenceCache(Object entity, PersistenceDelegator pd, Object entityId) { MainCache mainCache = (MainCache) pd.getPersistenceCache().getMainCache(); String nodeId = ObjectGraphUtils.getNodeId(entityId, entity.getClass()); Node node = new Node(nodeId, entity.getClass(), new ManagedState(), pd.getPersistenceCache(), entityId, pd); node.setData(entity); node.setPersistenceDelegator(pd); mainCache.addNodeToCache(node); } PersistenceCacheManager(PersistenceCache pc); void clearPersistenceCache(); void markAllNodesNotTraversed(); static void addEntityToPersistenceCache(Object entity, PersistenceDelegator pd, Object entityId);  }### Answer:
@Test public void testAddEntityToPersistenceCache() { }