currentSsoType = Constants.NONE;
        FessUserBean user = FessUserBean.empty();
        assertNull(ssoManager.logout(user));
    }

    @Test
    public void test_logout_whenAvailableButNoAuthenticator() {
        currentSsoType = "invalid";
        ssoManager = new SsoManager() {
            @Override
            protected String getSsoType() {
                return currentSsoType;