중복회원예외 test fail

안녕하세요 MemberServiceTest실행 도중에 계속 이러한 에러가 발생하여 질문 드립니다!

제 memberservicetest 코드입니다

감사합니다!

import jpagroup.jpashop.domain.Member;
import jpagroup.jpashop.repository.MemberRepository;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.transaction.annotation.Transactional;

import javax.persistence.EntityManager;

import static org.junit.Assert.*;

@RunWith(SpringRunner.class)
@SpringBootTest
@Transactional
public class MemberServiceTest {

    @Autowired MemberService memberService;
    @Autowired MemberRepository memberRepository;
    @Autowired EntityManager em;

    @Test
    public void 회원가입() throws Exception {
        //given
        Member member = new Member();
        member.setName("kim");

        //when
        Long savedId = memberService.join(member);

        //then
        assertEquals(member, memberRepository.findOne(savedId));
    }

    @Test(expected = IllegalStateException.class)
    public void 중복_회원_예외() throws Exception {
        //given
        Member member1 = new Member();
        member1.setName("kim");

        Member member2 = new Member();
        member2.setName("kim");

        //when
        memberService.join(member1);
        try {
            memberService.join(member2); //예외가 발생해야 한다!!!
        } catch (IllegalStateException e) {
            System.out.println("test실패");
            return;
        }

        //then
        Assert.fail("예외가 발생해야 한다.");
    }
}

@Test
    public void 중복_회원_예외() throws Exception {
        //given
        Member member1 = new Member();
        member1.setName("kim");

        Member member2 = new Member();
        member2.setName("kim");

        //when
        memberService.join(member1);
        try {
            memberService.join(member2); //예외가 발생해야 한다!!!
        } catch (IllegalStateException e) {
            System.out.println("test실패");
            return;
        }

        //then
        Assert.fail("예외가 발생해야 한다.");
    }

@Test(expected = IllegalStateException.class)
    public void 중복_회원_예외() throws Exception {
        //given
        Member member1 = new Member();
        member1.setName("kim");

        Member member2 = new Member();
        member2.setName("kim");

        //when
        memberService.join(member1);
     
        memberService.join(member2); //예외가 발생해야 한다!!!
      

        //then
        Assert.fail("예외가 발생해야 한다.");
    }

private void validateDuplicateMember(Member member) {
    List<Member> findMembers = memberRepository.findByName(member.getName());
    if (!findMembers.isEmpty()) {
        throw new IllegalStateException("이미 존재하는 회원입니다.");
    }
}

"이미 존재하는 회원입니다."