realm.users().create(user1);
UserRepresentation user2 = new UserRepresentation();
user2.setUsername("user2");
user2.attribute("attr1", "value1user2");
user2.attribute("attr2", "value2user2");
realm.users().create(user2);
user1 = realm.users().get("user1").toRepresentation();
assertEquals(2, user1.getAttributes().size());
assertEquals("value1user1", user1.getAttributes().get("attr1"));