/**
   * Tests to make a user the owner of a group.
   *
   * @throws Exception Thrown if an error occurred.
   */
  @Test
  public void testSetOwner() throws Exception {
    // First create a new user.
    String uuid = UUID.randomUUID().toString();
    Experimenter e = new ExperimenterI();
    e.setOmeName(omero.rtypes.rstring(uuid));
    e.setFirstName(omero.rtypes.rstring("user"));
    e.setLastName(omero.rtypes.rstring("user"));
    IAdminPrx svc = root.getSession().getAdminService();

    // already tested
    ExperimenterGroup g = new ExperimenterGroupI();
    g.setName(omero.rtypes.rstring(uuid));
    g.getDetails().setPermissions(new PermissionsI("rw----"));

    // create group.
    long groupId = svc.createGroup(g);
    g = svc.lookupGroup(uuid);
    // create the user.
    long expId = svc.createUser(e, uuid);
    e = svc.lookupExperimenter(uuid);
    // set the user as the group owner.
    svc.setGroupOwner(g, e);
    IQueryPrx query = root.getSession().getQueryService();
    String sql = "select m from GroupExperimenterMap as m ";
    sql += "left outer join fetch m.child as c ";
    sql += "left outer join fetch m.parent as p ";
    sql += "where ";
    sql += "c.id = :expId ";
    sql += " and p.id = :groupId";
    ParametersI p = new ParametersI();
    p.addLong("expId", expId);
    p.addLong("groupId", groupId);
    List l = (List) query.findAllByQuery(sql, p);
    Iterator i = l.iterator();
    GroupExperimenterMap map;
    while (i.hasNext()) {
      map = (GroupExperimenterMap) i.next();
      assertTrue(map.getOwner().getValue());
    }
  }