개발한 기능을 실행해서 테스트 할 때 자바의 main 메서드를 통해서 실행하거나, 웹 애플리케이션의 컨트롤러를 통해서 해당 기능을 실행한다. 이러한 방법은 준비하고 실행하는데 오래 걸리고, 반복 실행하기 어렵고 여러 테스트를 한번 에 실행하기 어렵다는 단점이 있다. 자바는 JUnit이라는 프레임워크로 테스트를 실행해서 이러한 문제를 해결한다.
회원 리포지토리 메모리 구현체 테스트
// src/test/java
package hello.hellospring.repository;
import hello.hellospring.domain.Member;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Test;
import java.util.List;
import java.util.Optional;
import static org.assertj.core.api.Assertions.*;
class MemoryMemberRepositoryTest {
MemoryMemberRepository repository = new MemoryMemberRepository();
@AfterEach
public void afterEach() {
repository.clearStore();
}
@Test
public void save() {
//given
Member member = new Member();
member.setName("spring");
//when
repository.save(member);
//then
Member result = repository.findById(member.getId()).get();
(result).isEqualTo(member);
}
@Test
public void findByName() {
//given
Member member1 = new Member();
member1.setName("spring1");
repository.save(member1);Member member2 = new Member();
member2.setName("spring2");
repository.save(member2);
//when
Member result = repository.findByName("spring1").get();
//then
assertThat(result).isEqualTo(member1);
}
@Test
public void findAll() {
//given
Member member1 = new Member();
member1.setName("spring1");
repository.save(member1);
Member member2 = new Member();
member2.setName("spring2");
repository.save(member2);
//when
List<Member> result = repository.findAll();
//then
assertThat(result.size()).isEqualTo(2);
}
}
package hello.hellospring.service;
import hello.hellospring.domain.Member;import hello.hellospring.repository.MemberRepository;
import java.util.List;
import java.util.Optional;
public class MemberService {
private final MemberRepository memberRepository = new
MemoryMemberRepository();
/**
* 회원가입
*/
public Long join(Member member) {
validateDuplicateMember(member); //중복 회원 검증
memberRepository.save(member);
return member.getId();
}
private void validateDuplicateMember(Member member) {
memberRepository.findByName(member.getName())
.ifPresent(m -> {
throw new IllegalStateException("이미 존재하는 회원입니다.");
});
}
/**
* 전체 회원 조회
*/
public List<Member> findMembers() {
return memberRepository.findAll();
}
public Optional<Member> findOne(Long memberId) {
return memberRepository.findById(memberId);
}
}
기존에는 회원 서비스가 메모리 회원 리포지토리를 직접 생성하게 했다.
public class MemberService {
private final MemberRepository memberRepository =
new MemoryMemberRepository();
}
*회원 리포지토리의 코드가 회원 서비스 코드를 ID 가능하게 변경한다.
public class MemberService {
private final MemberRepository memberRepository;
public MemberService(MemberRepository memberRepository) {
this.memberRepository = memberRepository;
}
...
}
회원 서비스 테스트
package hello.hellospring.service;
import hello.hellospring.domain.Member;
import hello.hellospring.repository.MemoryMemberRepository;
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;
MemoryMemberRepository memberRepository;
@BeforeEach
public void beforeEach() {
memberRepository = new MemoryMemberRepository();
memberService = new MemberService(memberRepository);
}
@AfterEach
public void afterEach() {
memberRepository.clearStore();
}
@Test
public void 회원가입() throws Exception {
//Given
Member member = new Member();
member.setName("hello");
//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.
assertThat(e.getMessage()).isEqualTo("이미 존재하는 회원입니다.");
}
}