public void test_allowEmptyGroupAndRole() {
        final AtomicBoolean allowEmptyPermission = new AtomicBoolean();
        ComponentUtil.setFessConfig(new FessConfig.SimpleImpl() {
            public boolean isLdapAllowEmptyPermission() {
                return allowEmptyPermission.get();
            }

            public String getRoleSearchUserPrefix() {
                return "1";
            }
        });