refactor: 게시글 조회 응답 수정

src/main/java/com/swyp8team2/post/presentation/CreatePostResponse.java

@@ -0,0 +1,4 @@
+package com.swyp8team2.post.presentation;
+
+public record CreatePostResponse(Long postId) {
+}

src/main/java/com/swyp8team2/post/presentation/PostController.java

@@ -32,12 +32,12 @@ public class PostController {
     private final PostService postService;
 
     @PostMapping("")
-    public ResponseEntity<Void> createPost(
+    public ResponseEntity<CreatePostResponse> createPost(
             @Valid @RequestBody CreatePostRequest request,
             @AuthenticationPrincipal UserInfo userInfo
     ) {
-        postService.create(userInfo.userId(), request);
-        return ResponseEntity.ok().build();
+
+        return ResponseEntity.ok(new CreatePostResponse(postService.create(userInfo.userId(), request)));
     }
 
     @GetMapping("/{postId}")

src/test/java/com/swyp8team2/post/presentation/PostControllerTest.java

@@ -48,13 +48,17 @@ void createPost() throws Exception {
                 "제목",
                 List.of(new PostImageRequestDto(1L), new PostImageRequestDto(2L))
         );
+        given(postService.create(any(), any()))
+                .willReturn(1L);
+        CreatePostResponse response = new CreatePostResponse(1L);
 
         //when then
         mockMvc.perform(post("/posts")
                         .contentType(MediaType.APPLICATION_JSON)
                         .content(objectMapper.writeValueAsString(request))
                         .header(HttpHeaders.AUTHORIZATION, "Bearer token"))
                 .andExpect(status().isOk())
+                .andExpect(content().json(objectMapper.writeValueAsString(response)))
                 .andDo(restDocs.document(
                         requestHeaders(authorizationHeader()),
                         requestFields(
@@ -69,7 +73,13 @@ void createPost() throws Exception {
                                 fieldWithPath("images[].imageFileId")
                                         .type(JsonFieldType.NUMBER)
                                         .description("투표 후보 이미지 ID")
-                        )));
+                        ),
+                        responseFields(
+                                fieldWithPath("postId")
+                                        .type(JsonFieldType.NUMBER)
+                                        .description("게시글 Id")
+                        )
+                ));
     }
 
     @Test