회원서비스테스트 강의에서 fail();이 동작안합니다

요런 에러가 뜹니다

package hello.hellospring.service;

import hello.hellospring.domain.Member;
import hello.hellospring.repository.MemoryMemberRepository;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import static org.assertj.core.api.Assertions.*;
import static org.junit.jupiter.api.Assertions.*;

class MemberServiceTest {

//MemberService memberService = new MemberService();
//MemoryMemberRepository memberRepository = new MemoryMemberRepository();

MemberService memberService;
MemoryMemberRepository memberRepository;

// 동작하기 전에 MemberService에 넣어줌
@BeforeEach
public void beforeEach(){
// DI
memberRepository = new MemoryMemberRepository();
memberService = new MemberService(memberRepository);
}

@AfterEach
public void afterEach() {
memberRepository.clearStore();
}

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

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

// then
Member findMember = memberService.findOne(saveId).get();
assertThat(member.getName()).isEqualTo(findMember.getName());
}

@Test
void 중복_회원_예외() {
// given
Member member1 = new Member();
member1.setName("spring");

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

// when
//try-catch 방법
try {
memberService.join(member2);
fail();
} catch (IllegalStateException e){
assertThat(e.getMessage()).isEqualTo("이미 존재하는 회원입니다.");
}

/*memberService.join(member1);
IllegalStateException e = assertThrows(IllegalStateException.class,
() -> memberService.join(member2));//예외가 발생해야 한다.

assertThat(e.getMessage()).isEqualTo("이미 존재하는 회원입니다.");*/
}

@Test
void findOne() {
}
}

해당 소스 입니다.