개발자 Lim

<Main 디렉토리>

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();
}

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 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());
    }

    public void clearStore(){
        store.clear();
    }
}

<Test 디렉토리>

package hello.hellospring.repository;

import hello.hellospring.domain.Member;
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 {

    MemoryMemberRepository repository = new MemoryMemberRepository();
    @AfterEach // 모든 검사가 끝날 때마다 실행되도록 하는 어노테이션
    public void afterEach(){
        // 각 검사가 끝날때 내용을 초기화 하지 않으면 예전 저장된 정보가 남아 문제가 생김
        repository.clearStore();
    }

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

        repository.save(member);

        Member result = repository.findById(member.getId()).get();
        //System.out.println("result = "+(result == member));
        //Assertions.assertEquals(member,null);
        assertThat(member).isEqualTo(result);
    }

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

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

        Member result = repository.findByName("spring1").get();
        assertThat(result).isEqualTo(member1);
    }

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

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

        List<Member> result = repository.findAll();

        assertThat(result.size()).isEqualTo(2);
    }
}

+ TTD: 미리 검증 가능한 테스트 틀을 만들어두고 하는 테스트 주도 개발 

윈도우 단축키: Ctrl+Shift+t (테스트 껍대기 자동 생성)

+ 테스트 폴더는 빌드되지 않으므로 직관적으로 한글을 써도 됨

+ 각 항목이 given, when, then의 총 3단계로 나뉘어지며 테스트됨