전체 실행하는데 오류가 안납니다

package hi.hellospring.repository;

import hi.hellospring.domain.Member;
import org.junit.jupiter.api.Test;
import org.assertj.core.api.Assertions;

import java.util.List;

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

public class MemoryMemberRepositoryTest {

    MemberRepository repository = new MemoryMemberRepository();


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

        repository.save(member);

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

       /* System.out.println("result = " + (result==member));

        Assertions.assertEquals(member,result);*/

        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);

        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);

    }
}

전문 코드입니다 쌤 클리어 코드를 작성 하지 않았는데도 

오류가 안나고

정상작동이 됩니다. 그리고 클리어 코드를 작성 했는데

clearStore를 가져오지 못합니다.

버전이 달라서 그런건가요 ?

package hi.hellospring.repository;

import hi.hellospring.domain.Member;

import java.util.HashMap;
import java.util.*;
import java.util.Map;
import java.util.Optional;

public class MemoryMemberRepository implements MemberRepository{

    private 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)); // 널이 있어도 일단 실행
    }

    @Override
    public Optional<Member> findbyName(String name) {
      return  store.values().stream().filter(member -> member.getName().equals(name)).findAny();//람다식 공부해야함 / findany 하나라도 있으면 찾음
    }

    @Override
    public List<Member> findAll() {

        return new ArrayList<>(store.values());
    }


}

입니다