테스트 코드

- 테스트 해볼 코드들. ※ repository public class MemoryMemberRepository implements MemberRepository{ private static Map 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 findById(Long id) { return Optional.of(store.get(id)); } @Override public Optio..