List<ChannelInterceptor> interceptors = channel.getInterceptors();
assertEquals(ImmutableMessageChannelInterceptor.class, interceptors.get(interceptors.size()-1).getClass());
WebSocketSession session = new TestWebSocketSession("s1");
webSocketHandler.afterConnectionEstablished(session);
TextMessage textMessage = StompTextMessageBuilder.create(StompCommand.SEND).headers("destination:/foo").build();
webSocketHandler.handleMessage(session, textMessage);
Message<?> message = channel.messages.get(0);