final Logger logger = LogManager.getLogger(MapFilterTest.class);
        final Map<String, String> eventMap = new HashMap<String, String>();
        eventMap.put("eventId", "Login");
        logger.debug(new MapMessage(eventMap));
        final Map<String,Appender<?>> appenders = config.getAppenders();
        final Appender app = appenders.get("LIST");
        assertNotNull("No List appender", app);
        final List<String> msgs = ((ListAppender) app).getMessages();
        assertNotNull("No messages", msgs);
        assertTrue("No messages", msgs.size() > 0);