feat[post]:페이징추가

Author: GarakChoi

backend/src/main/java/com/ai/lawyer/domain/post/controller/PostController.java

@@ -177,6 +177,9 @@ public ResponseEntity<ApiResponse<PostPageDTO>> getPostsPaged(
     ) {
         Pageable pageable = PageRequest.of(page, size, Sort.by("createdAt").descending());
         Page<PostDto> posts = postService.getPostsPaged(pageable);
+        if (posts == null) {
+            posts = new org.springframework.data.domain.PageImpl<>(java.util.Collections.emptyList(), pageable, 0);
+        }
         PostPageDTO response = new PostPageDTO(posts);
         return ResponseEntity.ok(new ApiResponse<>(200, "페이징 게시글 조회 성공", response));
     }

backend/src/test/java/com/ai/lawyer/domain/post/controller/PostControllerTest.java

@@ -145,4 +145,26 @@ void t6() throws Exception {
                         .cookie(new Cookie("accessToken", "valid-access-token")))
                 .andExpect(status().isOk());
     }
+
+    @Test
+    @DisplayName("게시글 페이징 API")
+    void t7() throws Exception {
+        java.util.List<com.ai.lawyer.domain.post.dto.PostDto> postList = java.util.List.of(
+            com.ai.lawyer.domain.post.dto.PostDto.builder().postId(1L).postName("테스트 제목").build()
+        );
+        org.springframework.data.domain.Pageable pageable = org.springframework.data.domain.PageRequest.of(0, 10);
+        org.springframework.data.domain.PageImpl<com.ai.lawyer.domain.post.dto.PostDto> page = new org.springframework.data.domain.PageImpl<>(postList, pageable, 1);
+        Mockito.when(postService.getPostsPaged(Mockito.any(org.springframework.data.domain.Pageable.class))).thenReturn(page);
+
+        mockMvc.perform(get("/api/posts/paged")
+                .param("page", "0")
+                .param("size", "10")
+                .cookie(new Cookie("accessToken", "valid-access-token")))
+            .andExpect(status().isOk())
+            .andExpect(org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath("$.result.content").isArray())
+            .andExpect(org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath("$.result.page").value(0))
+            .andExpect(org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath("$.result.size").value(10))
+            .andExpect(org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath("$.result.totalPages").value(1))
+            .andExpect(org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath("$.result.totalElements").value(1));
+    }
 }

backend/src/test/java/com/ai/lawyer/domain/post/service/PostServiceTest.java

@@ -127,4 +127,18 @@ void t11() {
         postService.patchUpdatePost(1L, updateDto);
         Mockito.verify(postService).patchUpdatePost(1L, updateDto);
     }
+
+    @Test
+    @DisplayName("게시글 페이징 조회")
+    void t12() {
+        java.util.List<PostDto> postList = java.util.List.of(new PostDto());
+        org.springframework.data.domain.Pageable pageable = org.springframework.data.domain.PageRequest.of(0, 10);
+        org.springframework.data.domain.PageImpl<PostDto> page = new org.springframework.data.domain.PageImpl<>(postList, pageable, 1);
+        Mockito.when(postService.getPostsPaged(pageable)).thenReturn(page);
+
+        var result = postService.getPostsPaged(pageable);
+        assertThat(result.getContent()).hasSize(1);
+        assertThat(result.getTotalElements()).isEqualTo(1);
+        assertThat(result.getTotalPages()).isEqualTo(1);
+    }
 }