result.setDescription(DfTypeUtil.toString(source.get("description")));
            result.setDestinationIndicator(DfTypeUtil.toString(source.get("destinationIndicator")));
            result.setDisplayName(DfTypeUtil.toString(source.get("displayName")));
            result.setEmployeeNumber(DfTypeUtil.toString(source.get("employeeNumber")));
            result.setEmployeeType(DfTypeUtil.toString(source.get("employeeType")));

    }

    // 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 {

    }

    public String getDisplayName() {
        checkSpecifiedProperty("displayName");
        return convertEmptyToNull(displayName);
    }

    public void setDisplayName(String value) {
        registerModifiedProperty("displayName");
        this.displayName = value;
    }

    public String getEmployeeNumber() {
        checkSpecifiedProperty("employeeNumber");

                (et, vl) -> ((User) et).setDestinationIndicator(DfTypeUtil.toString(vl)), "destinationIndicator");
        setupEpg(_epgMap, et -> ((User) et).getDisplayName(), (et, vl) -> ((User) et).setDisplayName(DfTypeUtil.toString(vl)),
                "displayName");
        setupEpg(_epgMap, et -> ((User) et).getEmployeeNumber(), (et, vl) -> ((User) et).setEmployeeNumber(DfTypeUtil.toString(vl)),
                "employeeNumber");

                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()));