24장 스프링 데이터 JPA 리포지토리로 변경

1)

interface로 생성

package study.querydsl.repository;

import org.springframework.data.jpa.repository.JpaRepository;
import study.querydsl.entity.Member;

import java.util.List;

public interface MemberRepository extends JpaRepository<Member, Long> {
    List<Member> findByUsername(String username);
}

2)

package study.querydsl.repository;

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 study.querydsl.entity.Member;

import javax.persistence.EntityManager;
import java.util.List;

import static org.assertj.core.api.Assertions.assertThat;

@SpringBootTest
@Transactional
class MemberRepositoryTest {

    @Autowired
    EntityManager em;

    @Autowired
    MemberRepository memberRepository;

    @Test
    public void basicTest(){

        Member member = new Member("member1",10);

        memberRepository.save(member);

        Member findMember = memberRepository.findById(member.getId()).get();
        assertThat(findMember).isEqualTo(member);

        List<Member> result1 = memberRepository.findAll();
        assertThat(result1).containsExactly(member);

        List<Member> result2 = memberRepository.findByUsername(member.getUsername());
        assertThat(result2).containsExactly(member);

        List<Member> result3 = memberRepository.findAll();
        assertThat(result3).containsExactly(member);

        List<Member> result4 = memberRepository.findByUsername(member.getUsername());
        assertThat(result4).containsExactly(member);
    }
}