TestCase

repository / Interface.

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();
    void clearStore();
}

 

repository 

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));
        // null 값 처리 해준다.
    }

    @Override
    public Optional<Member> findByName(String name) {
       return store.values().stream().filter(member ->member.getName().equals(name)).findAny();
    }

    @Override
    public List<Member> findAll() {
        return new ArrayList<>(store.values());
    }
    
    @Override
    public void clearStore() {
        store.clear();
    }
}

 

TEST CARE 

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;

public class MemoryMemberRepositoryTest {
    MemberRepository repository = new MemoryMemberRepository();

    // 메서드 실행 후 메모리 초기화 해주는 AfterEach
    // TDD 테스트 먼저 작성 후 구현
    @AfterEach
    public void afterEach(){
        repository.clearStore();
    }

    @Test
    public void save() {
        Member member = new Member();
        member.setName("spring");

        repository.save(member);
        Member result = repository.findById(member.getId()).get();
        Assertions.assertThat(member).isEqualTo(result);
    }
    @Test
    public void findByName() {
        Member member1 = new Member();
        member1.setName("spring1");
        repository.save(member1);


        Member member2 = new Member();
        member2.setName("spring1");
        repository.save(member2);

        Member result = repository.findByName("spring1").get();
        Assertions.assertThat(result).isEqualTo(member1);
    }
    @Test
    public void findAll() {
        Member member1 = new Member();
        member1.setName("spring1");
        repository.save(member1);


        Member member2 = new Member();
        member2.setName("spring1");
        repository.save(member2);

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

 

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