ObjectGraph graph1 = graphBuilder.getObjectGraph(a1, null);
pc.getMainCache().addGraphToCache(graph1, pc);
markAllNodeAsDirty();
flushManager.buildFlushStack(graph1.getHeadNode(), EventType.INSERT);
Deque<Node> fs = flushManager.getFlushStack();
Assert.assertEquals(6, fs.size());
flushManager.clearFlushStack();
a2.addAlbum(b2);