@Test
public void getUsers() {
List<User> users = registrationMgr.getUsers();
assertEquals(0, users.size());
em.getTransaction().begin();
User user1 = registrationMgr.registerUser("xxx8@yyy");
em.getTransaction().commit();
users = registrationMgr.getUsers();
assertEquals(1, users.size());
assertSame(users.get(0), user1);
em.getTransaction().begin();
User user2 = registrationMgr.registerUser("xxx9@yyy");
em.getTransaction().commit();
users = registrationMgr.getUsers();
assertEquals(2, users.size());
em.getTransaction().begin();
registrationMgr.registerUser("abc");
em.getTransaction().commit();
// geen nieuwe user toegevoegd, dus gedrag hetzelfde als hiervoor
users = registrationMgr.getUsers();
assertEquals(2, users.size());
}
