### Question:
SfcManager implements AutoCloseable, DataTreeChangeListener<ActionInstance> { @Override public void close() throws Exception { if (actionListener != null) { actionListener.close(); } } SfcManager(DataBroker dataBroker,
                      RpcProviderRegistry rpcRegistry,
                      ExecutorService executor); Set<IpAddress> getSfcSourceIps(); @Override void onDataTreeChanged(Collection<DataTreeModification<ActionInstance>> changes); RenderedServicePathFirstHop getRspFirstHop(String rspName); @Override void close(); static final String SFC_CHAIN_ACTION; static final String SFC_CHAIN_NAME; }### Answer:
@Test public void constructorTest() throws Exception { manager.close(); verify(actionListener).close(); }