assertEquals(1, events.size());
        assertEquals("ERROR", events.get(0).getLevel());
        assertEquals("org.codelibs.fess.test", events.get(0).getLoggerName());
        assertEquals("test error message", events.get(0).getMessage());
        assertNull(events.get(0).getThrowable());
    }

    @Test
    public void test_append_warnEvent_withErrorLevel() {

            return level;
        }

        /**
         * Returns the logger name.
         *
         * @return the logger name
         */
        public String getLoggerName() {
            return loggerName;
        }

        /**
         * Returns the log message.
         *
         * @return the log message
         */
        public String getMessage() {

        super(name, filter, layout, ignoreExceptions, properties);
        this.minLevel = minLevel;
    }

    @Override
    public void append(final LogEvent event) {
        final String loggerName = event.getLoggerName();
        if (loggerName != null) {
            for (final String excluded : EXCLUDED_LOGGERS) {
                if (loggerName.startsWith(excluded)) {
                    return;
                }
            }

            sb.append('[')
                    .append(timestamp)
                    .append("] ")
                    .append(event.getLevel())
                    .append(' ')
                    .append(event.getLoggerName())
                    .append(" - ")
                    .append(message)
                    .append('\n');
            if (sb.length() > maxDetailsLength) {
                sb.setLength(maxDetailsLength);