[Spring Boot] initializationError 해결(@RunWith 관련)

@RunWith(SpringRunner.class) 매핑 시 initializationError 발생

1) 발생

package jpabook.jpashop;

import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.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;

@RunWith(SpringRunner.class)
@SpringBootTest
public class MemberRepositoryTest {

    @Autowired
    MemberRepository memberRepository;

    @Test @Transactional
    public void testMember() throws Exception {
        //given
        Member member = new Member();
        member.setUsername("memberA");
        //when
        Long savedId = memberRepository.save(member);
        Member findMember = memberRepository.find(savedId);
        //then
        Assertions.assertThat(findMember.getId()).isEqualTo(member.getId());
        Assertions.assertThat(findMember.getUsername()).isEqualTo(member.getUsername());
    }
}

위의 코드를 실행한 결과 아래와 같은 에러가 발생

initializationError 발생

2) 원인

@RunWith는 Junit4일때 사용하는데, 현재 스프링 부트의 경우 JUnit5를 기본으로 사용해서 해당 코드를 제거해야 동작한다.

3) 해결

package jpabook.jpashop;

import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.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;

@SpringBootTest
public class MemberRepositoryTest {

    @Autowired
    MemberRepository memberRepository;

    @Test @Transactional
    public void testMember() throws Exception {
        //given
        Member member = new Member();
        member.setUsername("memberA");
        //when
        Long savedId = memberRepository.save(member);
        Member findMember = memberRepository.find(savedId);
        //then
        Assertions.assertThat(findMember.getId()).isEqualTo(member.getId());
        Assertions.assertThat(findMember.getUsername()).isEqualTo(member.getUsername());
    }
}

테스트 결과 정상 동작