MemberServiceTest 회원가입 오류

안녕하세요 질문 사항이 있어 글을 남깁니다.

구글링을 통해

Member findMember = memberService.findOne(savId).get();

부분이 오류가 있다는 것을 알았습니다.

그리고 나서 다시 로직을 보면서 다시 하여도 똑같은 오류가 발생해 글을 올립니다.

MemberServiceTest

package com.test.inflearn.service;

import com.test.inflearn.domain.Member;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.Test;

import java.util.Optional; //회색

import static org.junit.jupiter.api.Assertions.*; /회색

class MemberServiceTest {

    MemberService memberService = new MemberService();


    @Test
    void 회원가입() {
        //given (뭔가가 주어졌을 때)
        Member member = new Member();
        member.setName("hello");

        //when (이걸로 실행 했을 때)
        Long savId = memberService.join(member);

        //then (결과가 이게 나와야 한다.)
        Member findMember = memberService.findOne(savId).get();
        Assertions.assertThat(member.getName()).isEqualTo(findMember.getName());
    }

    @Test
    void findMembers() {
    }

    @Test
    void findOne() {
    }
}

MemberService

package com.test.inflearn.service;

import com.test.inflearn.domain.Member;
import com.test.inflearn.repository.MemberRepository;
import com.test.inflearn.repository.MemoryMemberRepository;
import java.util.List;
import java.util.Optional;

public class MemberService {

    private final MemberRepository memberRepository = new MemoryMemberRepository();

    /**
     * 회원 가입
     */
    public Long join(Member member) {
        //같은 이름이 있는 중복 가입 X
        validateDuplicateMemory(member); //중복 회원 검증
        memberRepository.save(member);
        return member.getId();

    }

    private void validateDuplicateMemory(Member member) {
        memberRepository.findByName(member.getName())
                .ifPresent(m -> {
                    throw new IllegalStateException("이미 존재하는 회원 입니다.");
                });
    }


    /**
     *전체 회원 조회
     */
    public List<Member> findMembers() {
        return memberRepository.findAll();
    }


    public Optional<Member> findOne(Long memberId) {
        return memberRepository.findById(memberId);
    }


}

repository = MemberRepository(인터페이스)

package com.test.inflearn.repository;

import com.test.inflearn.domain.Member;

import java.util.List;
import java.util.Optional;

public interface MemberRepository {

    Member save(Member member);
    Optional<Member> finById(Long id);
    Optional<Member> findByName(String name);
    List<Member> findAll();

    Optional<Member> findById(Long memberId);

//    Optional<Member> findById(Long memberId);
}

repository = MemberRepository (클래스)

package com.test.inflearn.repository;

import com.test.inflearn.domain.Member;

import java.util.*;

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> finById(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());
    }

    @Override
    public Optional<Member> findById(Long memberId) {
        return Optional.empty();
    }


    //test 를 한번 할때 마다 지워준다.
    public void clearStore() {
        store.clear();
    }
}

domain = Member

package com.test.inflearn.domain;

public class Member {


    private Long id;
    private String name;


    //get, set
    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;
    }
}

오류 메시지

at java.util.Optional.get(Optional.java:135)

at com.test.inflearn.service.MemberServiceTest.회원가입(MemberServiceTest.java:26)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:725)

at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)

at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)

at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)

at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)

at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)

at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)

at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)

at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)

at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)

at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)

at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)

at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)

at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)

at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$7(TestMethodTestDescriptor.java:214)