스프링 컨테이너와 DB까지 연결한 통합 테스트를 진행해보자.

회원 서비스 스프링 통합 테스트

package hello.hellospring.service;

import hello.hellospring.domain.Member;
import hello.hellospring.repository.MemberRepository;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.transaction.annotation.Transactional;

import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;

@SpringBootTest
@Transactional
class MemberServiceIntegrationTest {

    @Autowired MemberService memberService;
    @Autowired MemberRepository memberRepository;

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

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

        // Then
        Member findMember = memberRepository.findById(saveId).get();
        assertEquals(member.getName(), findMember.getName());
    }

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

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

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

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