def METHOD_NAME(self, group, users, one_owner_and_two_developers):
    no_of_members_before = len(group.members.list())
    user_to_add = f"{users[3].username}"
    add_users = f"""
        projects_and_groups:
          {group.full_path}/*:
            group_members:
              users:
                {randomize_case(users[0].username)}:
                  access_level: {AccessLevel.OWNER.value}
                {randomize_case(users[1].username)}:
                  access_level: {AccessLevel.DEVELOPER.value}
                {randomize_case(users[2].username)}:
                  access_level: {AccessLevel.DEVELOPER.value}
                {randomize_case(user_to_add)}: # new user 1
                  access_level: {AccessLevel.DEVELOPER.value}
        """
    run_gitlabform(add_users, group)
    members = group.members.list()
    assert len(members) == no_of_members_before + 1
    members_usernames = [member.username for member in members]
    assert members_usernames.count(user_to_add) == 1