getMockRequest().setLocale(null);
        assertEquals("https://discuss.codelibs.org/c/FessEN/", systemHelper.getForumLink());
        ComponentUtil.setFessConfig(new FessConfig.SimpleImpl() {
            private static final long serialVersionUID = 1L;

            @Override
            public String getForumLink() {
                return StringUtil.EMPTY;
            }