fileList = systemHelper.refreshDesignJspFiles();
        assertEquals(1, fileList.size());
        assertEquals("ok", FileUtil.readText(fileList.get(0).toFile()));
    }

    @Test
    public void test_updateSystemProperties() {
        final SystemHelper helper = new SystemHelper();
        final AtomicReference<String> appValue = new AtomicReference<>(StringUtil.EMPTY);
        ComponentUtil.setFessConfig(new FessConfig.SimpleImpl() {