List<TestUser> users = createTestNodes(TestUser.class, 2);
TestUser user1 = (TestUser) users.get(0);
List<Group> groups = createTestNodes(Group.class, 1);
Group group1 = (Group) groups.get(0);
TestOne t1 = createTestNode(TestOne.class);
t1.setProperty(AbstractNode.owner, user1);
t1.setProperty(AbstractNode.owner, group1);