}

    @Test
    public void test_user_displayName() {
        final User user = new User();
        assertNull(user.getDisplayName());

        user.setDisplayName("John Doe");
        assertEquals("John Doe", user.getDisplayName());
    }

    @Test
    public void test_user_labeledURI() {
        final User user = new User();

    }

    // Helper method to create test user
    private User createTestUser(String username, String displayName) {
        User user = new User();
        user.setName(username);
        user.setDisplayName(displayName);
        return user;
    }

    // Test implementation of AuthenticationChain for testing
    private static class TestAuthenticationChain implements AuthenticationChain {

                setAttributeValue(result, fessConfig.getLdapAttrRegisteredAddress(), o -> user.setRegisteredAddress(o.toString()));
                setAttributeValue(result, fessConfig.getLdapAttrDisplayName(), o -> user.setDisplayName(o.toString()));
                setAttributeValue(result, fessConfig.getLdapAttrPreferredLanguage(), o -> user.setPreferredLanguage(o.toString()));