### Question:
PoulpeGroup extends Group { public void addUsers(List<User> users) { super.getUsers().addAll(setThisGroupOfUsers(users)); }  @Override void setUsers(List<User> users); void addUsers(List<User> users); void removeUsers(List<User> users);  }### Answer:
@Test public void testAddUsers(){ PoulpeGroup poulpeGroup = new PoulpeGroup(); poulpeGroup.addUsers(new ArrayList<User>(createPoulpeUsers())); isUsersInGroup(poulpeGroup); }