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명세 : 요구사항 분석하기
given : 테스트 시나리오 위한 데이터 세팅
when : 테스트할 로직을 테스트 데이터를 통해 실행
then : 실행 후 결과값 검증
테스트 코드 작성 이유 : 코드가 잘 짜여져 있는지 확인 하기 위해
@SpringBootTest 역할 : 테스트 환경
@test 혁할 : 테스트 실행
mockito 쓰는 이유 : 가짜객체. 의존성
assertAll 역할 : 검증, 객체 등 데이터 많을 경우 검증할 데이터 모아놓기 위해