멤버 테스트중 회원 가입 테스트시에 에러가 발생해서여

안녕하세여 최고의 자바 티처 김영한 선생님

멤버 서비스 계층까지 만들고 멤버 테스트에서 회원 가입하는데아래와 같은 에러가 발생해서여 어떻게 고치는게 맞는건지 잘몰겠어서여 ㅠ 같은 내용으로 메일과 프로젝트 압축 파일 첨부도 보냈어여 봐주시면 감사여

에러 내용:  

java.lang.NullPointerException: Cannot invoke "javax.persistence.EntityManager.createQuery(String, java.lang.Class)" because "this.em" is null

at jpabook.jpashop.repository.MemberRepository.findByName(MemberRepository.java:31)

at jpabook.jpashop.repository.MemberRepository$$FastClassBySpringCGLIB$$97f1c501.invoke(<generated>)

at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)

at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)

at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)

at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:137)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)

at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)

at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691)

at jpabook.jpashop.repository.MemberRepository$$EnhancerBySpringCGLIB$$d04a376a.findByName(<generated>)

at jpabook.jpashop.MemberService.MemberService.validateDuplicateMember(MemberService.java:29)

at jpabook.jpashop.MemberService.MemberService.join(MemberService.java:23)

@Service
@Transactional(readOnly = true)
@RequiredArgsConstructor
public class MemberService {

    private MemberRepository memberRepository;

@Service
@Transactional(readOnly = true)
@RequiredArgsConstructor
public class MemberService {

    private final MemberRepository memberRepository;