return;
            }

            final FessConfig fessConfig = ComponentUtil.getFessConfig();
            final int maxMessageLength = getMaxMessageLength(fessConfig);
            if (message.length() > maxMessageLength) {
                logger.warn("Chat message exceeds max length. length={}, max={}", message.length(), maxMessageLength);

        assertEquals("ok", response.get("status"));
        assertTrue(response.containsKey("sources"));
        assertEquals(sources, response.get("sources"));
    }

    // ===== getMaxMessageLength tests =====

    @Test
    public void test_getMaxMessageLength_default() {
        ComponentUtil.setFessConfig(new FessConfig.SimpleImpl() {
            private static final long serialVersionUID = 1L;