esController.nodeStore.Add(node1)
	esController.nodeStore.Add(node2)
	esController.addNode()
	esController.addNode()
	assert.Equal(t, 1, esController.topologyQueue.Len())
	esController.processNextTopologyWorkItem(logger)
	assert.Equal(t, 0, esController.topologyQueue.Len())
	// The Nodes don't have the zone label, AddHints should fail.
	_, _, eventsBuilders := esController.topologyCache.AddHints(logger, sliceInfo)