Portfolio


<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-core</artifactId>
    <version>3.1.0</version>
    <scope>test</scope>
</dependency>


<-- Mockito Jupiter - JUnit과 Mockito의 연동 (JUnit의 Extention임) -->
<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-junit-jupiter</artifactId>
    <version>3.1.0</version>
    <scope>test</scope>
</dependency>


MemberService memberService = Mockito.mock(MemberService.class);
StudyRepository studyRepository = Mockito.(StudyRepository.class);

Mockito.mock 사용


@Mock MemberService memberService;
@Mock StudyRepository studyRepository;

필드에 @Mock 추가


@Test
void createStudyService(@Mock MemberService memberService,
                        @Mock StudyRepository studyRepository) {
    ...
}

테스트 메소드의 파라미터에 추가


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

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

        Mockito.when(memberService.findById(ArgumentMatchers.any()))
                .thenReturn(Optional.of(member))
                .thenThrow(new RuntimeException())
                .thenReturn(Optional.empty());

        Optional<Member> byId = memberService.findById(1L);
        assertEquals("keesun@email.com", byId.get().getEmail());

        assertThrows(RuntimeException.class, () -> {
            memberService.findById(2L);
        });

        assertEquals(Optional.empty(), memberService.findById(3L));
    }

2부 - Mockito

Mock을 활용한 테스트를 작성하는법