인프런 커뮤니티 질문&답변

[질문 템플릿]
1. 강의 내용과 관련된 질문인가요? (예)
2. 인프런의 질문 게시판과 자주 하는 질문에 없는 내용인가요? (아니오)
3. 질문 잘하기 메뉴얼을 읽어보셨나요? (예)

[질문 내용]
Member

package hello.hellospring.domain;

public class Member {

    private Long id; //고객이 정하는 id가 아닌 시스템이 정하는 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 spring) {
        this.name = name;
    }
}

MemoryMemberRepository

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));
        //null일 경우 null로 반환하지 않고 Optional로 감싸서 반환
    }

    @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()); //values는 Member
    }

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

MemoryMemberRepositoryTest

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
    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.assertEquals(member, result);
        assertThat(member).isEqualTo(result);
        System.out.println("result= " +(member == 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) ;

    }
}

위와 같이 코드 작성했는데 findByName() 쪽에서 NullPoint 에러가 나서 여쭤봅니다...

다른 질문 내용들도 읽어봤는데 코드상으로는 맞게 작성한 것 같은데

도움 부탁드립니다... ㅜ