findByName에서 NullPointerException

<Member class>

package hello.hellospring.domain;

public class Member {
    private Long 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 name) {
        this.name = name;
    }
}

<MemberRepository>

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();
}

<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));
    }

    @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();
//    };
}

<MemoryMemberRepository>

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 static org.assertj.core.api.Assertions.*;

public class MemoryMemberRepositoryTest {
    MemberRepository 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();
        assertThat(member).isEqualTo(result);
    }
    @Test
    public void findByName(){
        Member member1 = new Member();
        member1.setName("spring1");
        repository.save(member1);

        Member member2 = new Member();
        member1.setName("spring2");
        repository.save(member2);

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

    }

}

이런 오류가 발생합니다 name 도 전부 확인 해봤고 afterEach도 써봤지만 계속해서 같은 오류가 납니다.

 Member member1 = new Member();
        member1.setName("spring1");
        repository.save(member1);

        Member member2 = new Member();
        member1.setName("spring2");
        repository.save(member2)