[2025 겨울방학 스프링 스터디] 정채은 #2주차

<섹션 4> ..............

[ 비즈니스 요구사항 정리 ]

 

[ 회원 도메인과 리포지토리 만들기 ]

 

-회원 객체

package hello.hellospring.domain;

public class Member {

 private Long id;
 private String name;
 
 public Long getId() {
 return id;
 }
 
 public void setId(Long id) {
 this.id = id;
 }
 
 public String getName() {
 return name;
 }
 
 public void setName(String name) {
 this.name = name;
 }
 
}

 

- 회원 리포지토리 인터페이스

package hello.hellospring.repository;

import hello.hellospring.domain.Member;

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

public interface MemberRepository {

 Member save(Member member);
 Optional<Member> findById(Long id);
 Optional<Member> findByName(String name);
 List<Member> findAll();
 
}

 

-회원 리포지토리 메모리 구현체

package hello.hellospring.repository;

import hello.hellospring.domain.Member;

import java.util.*;


public class MemoryMemberRepository implements MemberRepository {

 private static Map<Long, Member> store = new HashMap<>();
 private static long sequence = 0L;
 
 @Override
 public Member save(Member member) {
 member.setId(++sequence);
 store.put(member.getId(), member);
 return member;
 }
 
 @Override
 public Optional<Member> findById(Long id) {
 return Optional.ofNullable(store.get(id));
 }
 
 @Override
 public List<Member> findAll() {
 return new ArrayList<>(store.values());
 }
 
 @Override
 public Optional<Member> findByName(String name) {
 return store.values().stream()
 .filter(member -> member.getName().equals(name))
 .findAny();
 }
 
 public void clearStore() {
 store.clear();
 }
}

 

[ 회원 리포지토리 테스트 케이스 작성 ]

생성 : src/test/java 하위 폴더

 

given : '무엇'인가 주어짐
when : '무엇' 실행
then : '무엇' 결과 생성

 

package hello.hellospring.repository;

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

import java.util.List;

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

class MemoryMemberRepositoryTest {

    MemoryMemerRepository repository = new MemoryMemerRepository();

    @AfterEach //테스트가 끝날 때마다 데이터를 지워줘야 함
    public void afterEach(){  //메서드가 끝날 때마다 동작
        repository.clearStore();
    }

    /*save 테스트*/
    @Test  //테스트할 수 있도록 @Test import해준다.
    public void save() {
    
        // given
        Member member = new Member();
        member.setName("spring");     //회원 이름을 지정
        
        // when
        repository.save(member);      //리포지토리에 회원 저장
        
        // then 검증 : 저장한 것과 꺼낸 것이 동일해야 한다.
        Member result = repository.findById(member.getId()).get();
        
        //System.out.println("result = " + (result == member));   동일하다면 true로 출력됨
        //Assertions.assertEquals(member, result);  동일하지 않으면 오류 발생 (Assertions : jupiter 사용시)
        assertThat(member).isEqualTo(result);  
    }

    /*findByName 테스트*/
    @Test
    public void findByName() {
    
        // given
        Member member1 = new Member();
        member1.setName("spring1");
        repository.save(member1);

        Member member2 = new Member();
        member2.setName("spring2");
        repository.save(member2);

        // when
        Member result = repository.findByName("spring1").get();
        
        // then
        assertThat(result).isEqualTo(member1);

    }

    /*findAll 테스트*/
    @Test
    public void findAll() {
    
        //  given
        Member member1 = new Member();
        member1.setName("spring1");
        repository.save(member1);

        Member member2 = new Member();
        member2.setName("spring2");
        repository.save(member2);

        // when
        List<Member> result = repository.findAll();
        
        // then
        assertThat(result.size()).isEqualTo(2);
    }
}

 

[회원 서비스 개발]

package hello.hellospring.service;

import hello.hellospring.domain.Member;
import hello.hellospring.repository.MemberRepository;
import hello.hellospring.repository.MemoryMemerRepository;

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

public class MemberService {

    private final MemberRepository memberRepository = new MemoryMemerRepository();

    /*
    회원 가입
     */
    public Long join(Member member) {
        //같은 이름인 중복 회원 X
        validateDuplicateMember(member);

        memberRepository.save(member);
        return member.getId();
    }

    private void validateDuplicateMember(Member member) {

        memberRepository.findByName(member.getName()) 
                .ifPresent(m -> {
                    throw new IllegalStateException("이미 존재하는 회원입니다.");
                });

//        Optional<Member> result = memberRepository.findByName(member.getName());
//        result.ifPresent(m -> {
//            throw new IllegalStateException("이미 존재하는 회원입니다.");
//        });
    }

    /*
    전체 회원 조회
     */
    public List<Member> findMembers() {
        return memberRepository.findAll(); //findAll의 반환 타임 : List
    }

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

 

[회원 서비스 테스트]

 

*회원 리포지토리의 코드가 회원 서비스 코드를 DI 가능하게 변경한다.

 

package hello.hellospring.service;

import hello.hellospring.domain.Member;
import hello.hellospring.repository.MemberRepository;
import hello.hellospring.repository.MemoryMemerRepository;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import java.util.Optional;

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

class MemberServiceTest {

    MemberService memberService;
    MemoryMemerRepository memberRepository;

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

    @AfterEach
    public void afterEach(){
        memberRepository.clearStore();
    }

    @Test
    public void 회원가입() {
    
        //given 무엇인가 주어졌을 때
        Member member = new Member();
        member.setName("spring");

        //when 이거를 실행을 시키고
        Long saveId = memberService.join(member);

        //then 결과가 이게 나와야 한다
        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);
//        try{       //실행할 코드
//            memberService.join(member2);
//            fail();
//        }catch(IllegalStateException e){     //예외
//            assertThat(e.getMessage()).isEqualTo("이미 존재하는 회원입니다.");
//        }

        memberService.join(member1);
        IllegalStateException e = assertThrows(IllegalStateException.class, () -> memberService.join(member2));   //assertThrows : 예외 처리 메서드, ()->가 실행되고 예외가 발생해야 한다.
        assertThat(e.getMessage()).isEqualTo("이미 존재하는 회원입니다.");

    }

    @Test
    void findMembers() {
    }

    @Test
    void findOne() {
    }
}