회원 도메인 실행과 테스트

1. 회원 도메인 - 회원 가입 main
- src/main/java/hello/core/member/MemberApp.java

package hello.core.member;

public class MemberApp {

    public static void main(String[] args) {
        MemberService memberService = new MemberServiceImpl();
        Member member = new Member(1L, "memberA", Grade.VIP);
        memberService.join(member);

        Member findMember = memberService.findMember(1L);
        System.out.println("new member = " + member.getName());
        System.out.println("find Member = " + findMember.getName());
    }

}

스프링 개입 없는 순수한 자바로 개발한 것을 테스트

애플리케이션 로직으로 테스트는 좋은 방법이 아니다. JUnit 테스트를 사용한다.


2. 회원 도메인 - 회원 가입 테스트
- src/test/java/hello/core/member/MemberServiceTest.java

package hello.core.member;

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

import static org.junit.jupiter.api.Assertions.*;

public class MemberServiceTest {

    MemberService memberService = new MemberServiceImpl();

    @Test
    void join() {
        // given : 주어진 것
        Member member = new Member(1L, "memberA", Grade.VIP);

        // when : 어떤 상황에 무엇을 했을 때
        memberService.join(member);
        Member findMember = memberService.findMember(1L);

        // then : 이렇게 됨
        Assertions.assertThat(member).isEqualTo(findMember);
    }

}

given : 주어진 것
when : 어떤 상황에 무엇을 했을 때
then : 이렇게 됨

테스트를 잘 작성하는 것이 중요하다.

1) 회원 도메인 설계의 문제점
#1 코드의 설계상 문제점은?
#2 다른 저장소로 변경시 OCP 원칙을 준수하는가?
#3 DIP 원칙을 준수하는가?
#4 의존관계가 인터페이스 뿐만 아니라 구현까지 모두 의존하는 문제점
-> 주문까지 만든 후 문제점과 해결 방안 확인


참고링크 : https://www.inflearn.com/course/%EC%8A%A4%ED%94%84%EB%A7%81-%ED%95%B5%EC%8B%AC-%EC%9B%90%EB%A6%AC-%EA%B8%B0%EB%B3%B8%ED%8E%B8?cid=325969

스프링 핵심 원리 - 기본편| 김영한 - 인프런 강의