test: Applicant 도메인 테스트 케이스 작성

Author: ysw789

src/test/java/dmu/dasom/api/domain/applicant/ApplicantServiceTest.java

@@ -0,0 +1,91 @@
+package dmu.dasom.api.domain.applicant;
+
+import dmu.dasom.api.domain.applicant.dto.ApplicantCreateRequestDto;
+import dmu.dasom.api.domain.applicant.dto.ApplicantResponseDto;
+import dmu.dasom.api.domain.applicant.entity.Applicant;
+import dmu.dasom.api.domain.applicant.repository.ApplicantRepository;
+import dmu.dasom.api.domain.applicant.service.ApplicantServiceImpl;
+import dmu.dasom.api.domain.common.exception.CustomException;
+import dmu.dasom.api.domain.common.exception.ErrorCode;
+import dmu.dasom.api.global.dto.PageResponse;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageImpl;
+import org.springframework.data.domain.PageRequest;
+
+import java.util.Collections;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+@ExtendWith(MockitoExtension.class)
+class ApplicantServiceTest {
+
+    @Mock
+    private ApplicantRepository applicantRepository;
+
+    @InjectMocks
+    private ApplicantServiceImpl applicantService;
+
+    @Test
+    @DisplayName("지원자 저장 - 성공")
+    void apply_success() {
+        // given
+        ApplicantCreateRequestDto request = mock(ApplicantCreateRequestDto.class);
+
+        // when
+        applicantService.apply(request);
+
+        // then
+        verify(applicantRepository).save(request.toEntity());
+    }
+
+    @Test
+    @DisplayName("지원자 저장 - 실패")
+    void apply_fail() {
+    }
+
+    @Test
+    @DisplayName("지원자 조회 - 성공")
+    void getApplicants_success() {
+        // given
+        int page = 0;
+        PageRequest pageRequest = PageRequest.of(page, 20);
+        Applicant applicant = mock(Applicant.class);
+        Page<Applicant> applicants = new PageImpl<>(Collections.singletonList(applicant), pageRequest, 1);
+        when(applicantRepository.findAllWithPageRequest(pageRequest)).thenReturn(applicants);
+        when(applicant.toApplicantResponse()).thenReturn(mock(ApplicantResponseDto.class));
+
+        // when
+        PageResponse<ApplicantResponseDto> response = applicantService.getApplicants(page);
+
+        // then
+        assertNotNull(response);
+        assertEquals(1, response.getContent().size());
+        verify(applicantRepository).findAllWithPageRequest(pageRequest);
+    }
+
+    @Test
+    @DisplayName("지원자 조회 - 실패 (결과 없음)")
+    void getApplicants_fail_emptyResult() {
+        // given
+        int page = 0;
+        PageRequest pageRequest = PageRequest.of(page, 20);
+        Page<Applicant> applicants = new PageImpl<>(Collections.emptyList(), pageRequest, 0);
+        when(applicantRepository.findAllWithPageRequest(pageRequest)).thenReturn(applicants);
+
+        // when
+        CustomException exception = assertThrows(CustomException.class, () -> {
+            applicantService.getApplicants(page);
+        });
+
+        // then
+        assertEquals(ErrorCode.EMPTY_RESULT, exception.getErrorCode());
+        verify(applicantRepository).findAllWithPageRequest(pageRequest);
+    }
+}