테스트에 대한 질문

// test 클래스 일부
@Test
void join() {
    //given
    Member member = MemberTestUtil.getMemberSample("sample1");
    //when, then 생략 
}

// MemberTestUtil 클래스
public class MemberTestUtil {
    public static Member getMemberSample(String descriptor) {
        Member member = new Member(); // Member는 @builder 포함
        switch (descriptor) {
                case "sample1":
                        member.builder().id(1L).name("memberA").grade(Grade.VIP);
                        break;
                case "sample2":
                        member.builder().id(2L).name("memberB").grade(Grade.VIP);
                       break;
                 // 생략
        }
        return member;
    }
}