headers.setSessionId("sess1");
headers.setSessionAttributes(new ConcurrentHashMap<>());
headers.setDestination("/foo");
Message<?> message = MessageBuilder.createMessage(new byte[0], headers.getMessageHeaders());
messageHandler.handleMessage(message);
message = channel.messages.get(0);
headers = StompHeaderAccessor.wrap(message);
assertEquals(SimpMessageType.MESSAGE, headers.getMessageType());