assertNull(result);
    }

    // Test logout method
    @Test
    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(response);
        assertEquals(expectedResponse, response);
    }

    // Test logout() method
    @Test
    public void test_logout_whenNotAvailable() {
        currentSsoType = Constants.NONE;
        FessUserBean user = FessUserBean.empty();
        assertNull(ssoManager.logout(user));
    }

    @Test
    public void test_logout_whenAvailableButNoAuthenticator() {

        assertEquals("LOGOUT", SsoResponseType.LOGOUT.toString());
    }

    @Test
    public void test_equals() {
        // Test equals method for enum constants
        assertTrue(SsoResponseType.METADATA.equals(SsoResponseType.METADATA));
        assertTrue(SsoResponseType.LOGOUT.equals(SsoResponseType.LOGOUT));
        assertFalse(SsoResponseType.METADATA.equals(SsoResponseType.LOGOUT));

    <error-code>403</error-code>
    <location>/WEB-INF/view/error/redirect.jsp?type=logOut</location>
  </error-page>
  <error-page>
    <error-code>404</error-code>
    <location>/WEB-INF/view/error/redirect.jsp?type=notFound</location>
  </error-page>
  <error-page>
    <error-code>408</error-code>
    <location>/WEB-INF/view/error/redirect.jsp?type=logOut</location>
  </error-page>
  <error-page>
    <error-code>429</error-code>

            }
        });
        log(valueMap);
    }

    /**
     * Log the logout activity.
     * @param user The user.
     */
    public void logout(final OptionalThing<FessUserBean> user) {
        final Map<String, String> valueMap = new LinkedHashMap<>();
        valueMap.put("action", Action.LOGOUT.name());
        valueMap.put("user", user.map(FessUserBean::getUserId).orElse("-"));

     * for session management, so no specific logout URL is provided.
     *
     * @param user The user to logout
     * @return Always returns null as SPNEGO doesn't provide a logout URL
     */
    @Override
    public String logout(final FessUserBean user) {
        return null;
    }

labels.login.title=Login
labels.index_label=Label
labels.index_lang=Preferred Language
labels.index_sort=Sort
labels.index_num=Display Count
labels.logout_title=Logout
labels.logout=Logout
labels.do_you_want_to_logout=Do you want to logout?
labels.logout_button=Logout
labels.profile=Change Password
labels.administration=Administration
labels.profile_button=Settings
labels.profile.title=Settings
labels.profile.update=Update

        activityHelper.useEcsFormat = false;
        activityHelper.logout(OptionalThing.empty());
        assertEquals("action:LOGOUT\tuser:-\tpermissions:-", localLogMsg.get());

        activityHelper.logout(createUser("testuser", new String[0]));
        assertEquals("action:LOGOUT\tuser:testuser\tpermissions:-", localLogMsg.get());

        activityHelper.logout(createUser("testuser", new String[] { "111", "222" }));

labels.login.title=Login
labels.index_label=Label
labels.index_lang=Preferred Language
labels.index_sort=Sort
labels.index_num=Display Count
labels.logout_title=Logout
labels.logout=Logout
labels.do_you_want_to_logout=Do you want to logout?
labels.logout_button=Logout
labels.profile=Change Password
labels.administration=Administration
labels.profile_button=Settings
labels.profile.title=Settings
labels.profile.update=Update

            return false;
        }

        @Override
        public void login(String username, String password) throws ServletException {
        }

        @Override
        public void logout() throws ServletException {
        }

        @Override
        public Collection<Part> getParts() throws IOException, ServletException {
            return null;
        }

        @Override