test: 댓글 생성 API 단위 테스트 작성

Author: dnzp75

src/test/java/com/example/log4u/domain/comment/service/CommonServiceTest.java

@@ -0,0 +1,79 @@
+package com.example.log4u.domain.comment.service;
+
+import static org.assertj.core.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.BDDMockito.*;
+
+import java.util.Optional;
+
+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 com.example.log4u.domain.comment.dto.request.CommentCreateRequestDto;
+import com.example.log4u.domain.comment.entity.Comment;
+import com.example.log4u.domain.comment.exception.NotFoundCommentException;
+import com.example.log4u.domain.comment.exception.UnauthorizedAccessException;
+import com.example.log4u.domain.comment.repository.CommentRepository;
+import com.example.log4u.domain.diary.exception.NotFoundDiaryException;
+import com.example.log4u.domain.diary.service.DiaryService;
+import com.example.log4u.domain.comment.dto.response.CommentCreateResponseDto;
+import com.example.log4u.fixture.CommentFixture;
+
+@DisplayName("댓글 API 단위 테스트")
+@ExtendWith(MockitoExtension.class)
+public class CommonServiceTest {
+
+	@InjectMocks
+	private CommentService commentService;
+
+	@Mock
+	private CommentRepository commentRepository;
+
+	@Mock
+	private DiaryService diaryService;
+
+	@DisplayName("성공 테스트: 댓글 생성")
+	@Test
+	void commentCreate_Success() {
+		// given
+		Long userId = 1L;
+		Long diaryId = 12L;
+
+		CommentCreateRequestDto requestDto = new CommentCreateRequestDto(diaryId, "댓글 내용");
+		Comment expectedComment = CommentFixture.createCommentFixture(100L, userId, diaryId);
+
+		doNothing().when(diaryService).checkDiaryExists(diaryId);
+		given(commentRepository.save(any(Comment.class))).willReturn(expectedComment);
+
+		// when
+		CommentCreateResponseDto response = commentService.addComment(userId, requestDto);
+
+		// then
+		assertThat(response.content()).isEqualTo(expectedComment.getContent());
+
+		verify(commentRepository).save(any(Comment.class));
+	}
+
+	@DisplayName("예외 테스트: 댓글 생성 - 존재하지 않는 다이어리에 댓글 생성 시 예외")
+	@Test
+	void commentCreate_Fail_DiaryNotFound() {
+		// given
+		Long userId = 1L;
+		Long diaryId = 999L;
+		CommentCreateRequestDto requestDto = new CommentCreateRequestDto(diaryId, "댓글 내용");
+
+		doThrow(new NotFoundDiaryException())
+			.when(diaryService).checkDiaryExists(diaryId);
+
+		// when & then
+		assertThrows(NotFoundDiaryException.class, () -> {
+			commentService.addComment(userId, requestDto);
+		});
+
+		verify(commentRepository, never()).save(any());
+	}
+}

src/test/java/com/example/log4u/fixture/CommentFixture.java

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+package com.example.log4u.fixture;
+
+import com.example.log4u.domain.comment.entity.Comment;
+
+public class CommentFixture {
+
+	public static Comment createCommentFixture(Long commentId, Long userId, Long diaryId) {
+		return Comment.builder()
+			.commentId(commentId)
+			.userId(userId)
+			.diaryId(diaryId)
+			.content("댓글 내용")
+			.build();
+	}
+
+	public static Comment createDefaultComment() {
+		return createCommentFixture(1L, 1L, 1L);
+	}
+}