assertEquals("___", ldapManager.replaceWithUnderscores("///"));
        assertEquals("a_a", ldapManager.replaceWithUnderscores("a/a"));
    }

    @Test
    public void test_allowEmptyGroupAndRole() {
        final AtomicBoolean allowEmptyPermission = new AtomicBoolean();
        ComponentUtil.setFessConfig(new FessConfig.SimpleImpl() {
            public boolean isLdapAllowEmptyPermission() {