인프런 커뮤니티 질문&답변

이것은 MemoryMemberRepository class 입니다. clearStore() 메서드에서 sequence 초기화 하지 않았을 때 테스트가 깨졌습니다. 따져보면 검증코드 실행 전에 깨진다고 볼 수 있겠네요. 아이디가 초기화 되지 않아서 Member.id == 1L 인 학생이 없으니까요.

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() {
//        sequence = 0L;
        store.clear();
    }

}

테스트 코드입니다.

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.assertThat;

class MemoryMemberRepositoryTest {
    MemoryMemberRepository repository = new MemoryMemberRepository();

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

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

        repository.save(member);

        Member saved_member = repository.findById(1L).get();

        assertThat(saved_member).isSameAs(member);

    }

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

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

        Member saved_member = repository.findByName("dave").get();
        assertThat(saved_member).isSameAs(member1);
    }

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

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

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

안녕하세요. 김대희님, 공식 서포터즈 David입니다.

강의 내 작성된 테스트는 save 후 findById, findByName, findAll 메서드들을 호출하기 때문에 각 테스트 내에서는 테스트가 깨지지 않을 것 같은데, 혹시 작성하신 테스트 코드 올려주실 수 있으실까요?

감사합니다.