public void setGivenName(String value) {
        registerModifiedProperty("givenName");
        this.givenName = value;
    }

    public String[] getGroups() {
        checkSpecifiedProperty("groups");
        return groups;
    }

    public void setGroups(String[] value) {
        registerModifiedProperty("groups");
        this.groups = value;
    }

    public String getHomeDirectory() {

        setupEpg(_epgMap, et -> ((User) et).getGivenName(), (et, vl) -> ((User) et).setGivenName(DfTypeUtil.toString(vl)), "givenName");
        setupEpg(_epgMap, et -> ((User) et).getGroups(), (et, vl) -> ((User) et).setGroups((String[]) vl), "groups");
        setupEpg(_epgMap, et -> ((User) et).getHomeDirectory(), (et, vl) -> ((User) et).setHomeDirectory(DfTypeUtil.toString(vl)),
                "homeDirectory");

        final User user = new User();
        assertNull(user.getGroups());

        final String[] groups = new String[] { "group1", "group2" };
        user.setGroups(groups);
        assertNotNull(user.getGroups());
        assertEquals(2, user.getGroups().length);
        assertEquals("group1", user.getGroups()[0]);
        assertEquals("group2", user.getGroups()[1]);
    }

    @Test

            result.setGidNumber(DfTypeUtil.toLong(source.get("gidNumber")));
            result.setGivenName(DfTypeUtil.toString(source.get("givenName")));
            result.setGroups(toStringArray(source.get("groups")));
            result.setHomeDirectory(DfTypeUtil.toString(source.get("homeDirectory")));
            result.setHomePhone(DfTypeUtil.toString(source.get("homePhone")));

        // Test with empty groups
        testUser.setGroupNames(new String[] {});
        assertNotNull(fessUserBean.getGroups());
        assertEquals(0, fessUserBean.getGroups().length);

        // Test with single group
        testUser.setGroupNames(new String[] { "developers" });
        String[] groups = fessUserBean.getGroups();
        assertEquals(1, groups.length);
        assertEquals("developers", groups[0]);