Mock 객체 확인

Mock 객체가 어떻게 사용됐는지 확인이 가능하다.

 

예시코드는 아래의 깃사이트에서 다운로드 받을 수 있으며

https://github.com/keesun/inflearn-the-java-test

캡쳐한 index를 다운받으면 된다.

 

Verifying exact number of invocations

javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html#exact_verification

특정 메소드가 특정 매개변수로 몇번 호출 되었는지, 최소 한번은 호출됐는지, 전혀 호출되지 않았는지

 

예시코드

 

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import java.util.Optional;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;

import me.whiteship.inflearnthejavatest.domain.Member;
import me.whiteship.inflearnthejavatest.domain.Study;
import me.whiteship.inflearnthejavatest.member.MemberService;

@ExtendWith(MockitoExtension.class)
class StudyServiceTest {

    @Mock MemberService memberService;
    @Mock StudyRepository studyRepository;

    @Test
    void createNewStudy() {
        StudyService studyService = new StudyService(memberService, studyRepository);
        assertNotNull(studyService);

        Member member = new Member();
        member.setId(1L);
        member.setEmail("rlawls1991@email.com");

        Study study = new Study(10, "테스트");

        when(memberService.findById(1L)).thenReturn(Optional.of(member));
        when(studyRepository.save(study)).thenReturn(study);

        studyService.createNewStudy(1L, study);
        assertEquals(member, study.getOwner());
        
        verify(memberService, times(1)).notify(study);
    }

}

 

위와같이 호출을 하게 된다면 오류가 발생할 것이다.

 

 

Wanted but not invoked:
memberService.notify(
    me.whiteship.inflearnthejavatest.domain.Study@6691490c
);
-> at me.whiteship.inflearnthejavatest.study.StudyServiceTest.createNewStudy(StudyServiceTest.java:43)

However, there was exactly 1 interaction with this mock:
memberService.findById(1L);
-> at me.whiteship.inflearnthejavatest.study.StudyService.createNewStudy(StudyService.java:23)

 

바로 도메인을 호출아지 않았다는 말인데 찾을 수 있게 수정을 해야 한다.

 

아래와 같이 return값을 설정해주면 mock객체가 찾을 수 있다.

public class StudyService {

    private final MemberService memberService;

    private final StudyRepository repository;

    public StudyService(MemberService memberService, StudyRepository repository) {
        assert memberService != null;
        assert repository != null;
        this.memberService = memberService;
        this.repository = repository;
    }

    public Study createNewStudy(Long memberId, Study study) {
        Optional<Member> member = memberService.findById(memberId);
        study.setOwner(member.orElseThrow(() -> new IllegalArgumentException("Member doesn't exist for id: '" + memberId + "'")));
        Study newStudy = repository.save(study);
        memberService.notify(study);
        return newStudy;
    }
}

 

Verification in order

https://javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html#in_order_verification

어떤 순서대로 호출했는지

 

 

Verification with timeout

https://javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html#verification_timeout

특정 시간 이내에 호출됐는지

 

 

Finding redundant invocations

https://javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html#finding_redundant_invocations

특정 싯점 이후에 아무 일도 벌어지지 않았는지

 

 

전체 예시

@ExtendWith(MockitoExtension.class)
class StudyServiceTest {

    @Mock MemberService memberService;
    @Mock StudyRepository studyRepository;

    @Test
    void createNewStudy() {
        StudyService studyService = new StudyService(memberService, studyRepository);
        assertNotNull(studyService);

        Member member = new Member();
        member.setId(1L);
        member.setEmail("rlawls1991@email.com");

        Study study = new Study(10, "테스트");

        when(memberService.findById(1L)).thenReturn(Optional.of(member));
        when(studyRepository.save(study)).thenReturn(study);

        studyService.createNewStudy(1L, study);
        assertEquals(member, study.getOwner());
        
        verify(memberService, times(1)).notify(study);
        verify(memberService, times(1)).notify(member);
        verify(memberService, never()).validate(any());
        
        InOrder inOrder = Mockito.inOrder(memberService);
        inOrder.verify(memberService).notify(study);
        
        //verifyNoMoreInteractions(memberService);
        inOrder.verify(memberService).notify(member);
        
    }
}