findByName 관련 에러

package hello.hellospring.repository;

import hello.hellospring.domain.Member;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;

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

public class MemoryMemberRepositoryTest {
    MemberRepository repository = new MemoryMemberRepository();

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

        Member result = repository.findById(member.getId()).get();

        Assertions.assertEquals(result, member);
        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);

        // member1 을 찾으면 에러가 나는데 왜일까..?
        Member result = repository.findByName("spring2").get();
        assertThat(result).isEqualTo(member2);
    }
}

위 코드로 테스트 하면 에러가 안납니다. 그런데 아래와 같이 spring1 을 찾으면 에러가 나네요..

package hello.hellospring.repository;

import hello.hellospring.domain.Member;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;

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

public class MemoryMemberRepositoryTest {
    MemberRepository repository = new MemoryMemberRepository();

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

        Member result = repository.findById(member.getId()).get();

        Assertions.assertEquals(result, member);
        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);

        // member1 을 찾으면 에러가 나는데 왜일까..?
        Member result = repository.findByName("spring1").get();
        assertThat(result).isEqualTo(member1);
    }
}

member1 과 비교하도록 수정도 했는데요.. 아래와 같이 나옵니다

무슨 이유일까요..?

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());
    }
}