[Java][Spring Boot] 회원관리 예제 테스트 코드

회원 서비스 개발

MemberService

package hello.hellospring.service;

import hello.hellospring.domain.Member;
import hello.hellospring.repositort.MemberRepository;
import hello.hellospring.repositort.MemoryMemberRepository;

import java.util.List;
import java.util.Optional;

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

    public Long join(Member member){
        validateDupliplicationMember(member);
        memberRepository.save(member);
        return member.getId();
    }
    private void validateDupliplicationMember(Member member){
        memberRepository.findByName(member.getName())
                .ifPresent(m -> {
                    throw new IllegalStateException("이미 존재하는 회원");
                });
    }
    public List<Member> findMembers(){
        return memberRepository.findAll();
    }

    public Optional<Member> findOne(Long memberId){
        return memberRepository.findById(memberId);
    }
}

회원 서비스 테스트

package hello.hellospring.service;

import hello.hellospring.domain.Member;
import hello.hellospring.repositort.MemoryMemberRepository;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.BeforeEach;


import static org.assertj.core.api.Assertions.*;
import static org.junit.jupiter.api.Assertions.*;

class MemberServiceTest {
    MemberService memberService;
    MemoryMemberRepository memberRepository;


    @BeforeEach
    public void beforeEach() {
        memberRepository = new MemoryMemberRepository();
        memberService = new MemberService(memberRepository);
    }

    @AfterEach
    public void afterEach() {
        memberRepository.clearStore();
    }
    @Test
    public void 회원가입() throws Exception {
//Given
        Member member = new Member();
        member.setName("hello");
//When
        Long saveId = memberService.join(member);
//Then
        Member findMember = memberRepository.findById(saveId).get();
        assertEquals(member.getName(), findMember.getName());
    }
    @Test
    public void 중복_회원_예외() throws Exception {
//Given
        Member member1 = new Member();
        member1.setName("spring");

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


        IllegalStateException e = assertThrows(IllegalStateException.class,
                () -> memberService.join(member2));//예외가 발생해야 한다. assertThat(e.getMessage()).isEqualTo("이미 존재하는 회원입니다.");

//        memberService.join(member1);
//        try {
//            memberService.join(member2);
//            fail();
//        }catch (IllegalStateException e){
//            assertThat(e.getMessage()).isEqualTo("이미 존재하는 회원1231");
//        }


    }
}

• @BeforeEach : 각 테스트 실행 전에 호출된다. 테스트가 서로 영향이 없도록 항상 새로운 객체를 생성하고, 의 존관계도 새로 맺어준다.

기존에는 회원 서비스가 메모리 회원 리포지토리를 직접 생성하게 했다.

 public class MemberService {
     private final MemberRepository memberRepository =
                                           new MemoryMemberRepository();
}

• 회원 리포지토리의 코드가
• 회원 서비스 코드를 DI 가능하게 변경한다.*

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

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