12会員サービステスト

が静的に消えた場合、各インスタンスは複数のリポジトリを作成します.

public class MemberService {
    private final MemberRepository memberRepository;

    public MemberService(MemberRepository memberRepository) {
        this.memberRepository = memberRepository;
    }
}

@BeforeEach
    public void berforeEach() {//테스트가 실행할 때마다 생성
        memberRepository = new MemoryMemberRepository();
        memberService = new MemberService(memberRepository);
    }

@Test
    void 회원가입() {//join
        //given 뭔가 주어졌을 때: 데이터
        Member member = new Member();
        member.setName("hello");

        //when 이게 실행됐을 때: 검증부분
        Long saveId = memberService.join(member);

        //then 결과가 이렇게 되어야 한다: 검증확인
        Member findMember = memberService.findOne(saveId).get();
        assertThat(member.getName()).isEqualTo(findMember.getName());
    }

@Test
    public void 중복_회원_예외(){
        //given
        Member member1 = new Member();
        member1.setName("spring");

        Member member2 = new Member();
        member2.setName("spring");

        //when
        memberService.join(member1);
        //방법1
        try {
            memberService.join(member2);//같은 이름으로 등록이 되면 fail
            fail();
        } catch (IllegalStateException e) {
            assertThat(e.getMessage()).isEqualTo("이미 존재하는 회원입니다.");
        }
        //방법2
        assertThrows(IllegalStateException.class, () -> memberService.join(member2));//member2를 넣으면 앞에 예외가 터져야함: 성공
        //방법3
        IllegalStateException e = assertThrows(IllegalStateException.class, () -> memberService.join(member2));
        assertThat(e.getMessage()).isEqualTo("이미 존재하는 회원입니다.");
        //then
    }