ActionResponse result = authenticator.getResponse(SsoResponseType.METADATA);

        // Verify
        assertNull(result);
    }

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