public void test_logout_withValidUser() {
        // Setup
        FessUserBean user = FessUserBean.empty();
        String expectedUrl = "https://example.com/logout?user=testuser123";
        authenticator.setLogoutUrl(expectedUrl);

        // Execute
        String result = authenticator.logout(user);

        // Verify
        assertNotNull(result);
        assertEquals(expectedUrl, result);

    }

    @Test
    public void test_logout_withValidAuthenticator() {
        currentSsoType = "test";
        final String expectedLogoutUrl = "https://example.com/logout";
        testAuthenticator.setLogoutUrl(expectedLogoutUrl);

        ssoManager = new SsoManager() {
            @Override
            protected String getSsoType() {
                return currentSsoType;
            }

            @Override