### Question:
BroadcastingSubscribableChannelWrapper extends AbstractSubscribableChannel implements IChannelReceiver { @Override public void destroy() throws Exception { myWrappedChannel.destroy(); myWrappedChannel.unsubscribe(myHandler); } BroadcastingSubscribableChannelWrapper(IChannelReceiver theChannel); SubscribableChannel getWrappedChannel(); @Override void destroy(); @Override void addInterceptor(ChannelInterceptor interceptor); @Override String getName();  }### Answer:
@Test public void testWrappedChannelDestroyed() throws Exception { BroadcastingSubscribableChannelWrapper svc = new BroadcastingSubscribableChannelWrapper(myReceiver); svc.destroy(); verify(myReceiver, times(1)).destroy(); }