#14 simple blog : get post api

simpleblog/src/main/java/com/example/simpleblog/controller/PostController.java

@@ -1,12 +1,11 @@
 package com.example.simpleblog.controller;
 
+import com.example.simpleblog.domain.Post;
 import com.example.simpleblog.request.PostCreate;
 import com.example.simpleblog.service.PostService;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestBody;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.*;
 
 import javax.validation.Valid;
 
@@ -21,4 +20,9 @@ public class PostController {
     public void post(@RequestBody @Valid PostCreate request) {
         postService.write(request);
     }
+
+    @GetMapping("/posts/{postId}")
+    public Post getPost(@PathVariable(name = "postId") Long id) {
+        return postService.getPost(id);
+    }
 }

simpleblog/src/main/java/com/example/simpleblog/service/PostService.java

@@ -23,4 +23,9 @@ public class PostService {
 
         postRepository.save(post);
     }
+
+    public Post getPost(Long id) {
+        return postRepository.findById(id)
+                .orElseThrow(() -> new IllegalArgumentException("존재하지 않는 글입니다."));
+    }
 }

simpleblog/src/test/java/com/example/simpleblog/controller/PostControllerTest.java

@@ -14,6 +14,7 @@ import org.springframework.test.web.servlet.MockMvc;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.springframework.http.MediaType.APPLICATION_JSON;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
 import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
@@ -82,7 +83,7 @@ class PostControllerTest {
 
     @Test
     @DisplayName("/posts 요청시 DB에 값이 저장된다.")
-    void save_post() throws Exception {
+    void save_post_success() throws Exception {
         // given
         PostCreate request = PostCreate.builder()
                 .title("글 제목입니다.")
@@ -107,4 +108,28 @@ class PostControllerTest {
         assertEquals("글 제목입니다.", post.getTitle());
         assertEquals("글 내용입니다.", post.getContent());
     }
+
+    @Test
+    @DisplayName("postId 로 글 조회")
+    void get_post_by_id_success() throws Exception {
+        // given
+        Post post = Post.builder()
+                .title("글 제목입니다.")
+                .content("글 내용입니다.")
+                .build();
+
+        postRepository.save(post);
+
+        // expected
+        mockMvc.perform(get("/posts/{postId}", post.getId())
+                        .contentType(APPLICATION_JSON)
+                )
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.id").value(post.getId()))
+                .andExpect(jsonPath("$.title").value("글 제목입니다."))
+                .andExpect(jsonPath("$.content").value("글 내용입니다."))
+                .andDo(print())
+        ;
+
+    }
 }

simpleblog/src/test/java/com/example/simpleblog/service/PostServiceTest.java

@@ -0,0 +1,69 @@
+package com.example.simpleblog.service;
+
+import com.example.simpleblog.domain.Post;
+import com.example.simpleblog.repository.PostRepository;
+import com.example.simpleblog.request.PostCreate;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@SpringBootTest
+class PostServiceTest {
+
+    @Autowired
+    private PostService postService;
+
+    @Autowired
+    private PostRepository postRepository;
+
+    @BeforeEach
+    void clean() {
+        postRepository.deleteAll();
+    }
+
+    @Test
+    @DisplayName("글 작성")
+    void post_service_test() throws Exception {
+        // given
+        PostCreate postCreate = PostCreate.builder()
+                .title("글 제목입니다.")
+                .content("글 내용입니다.")
+                .build();
+
+        // when
+        postService.write(postCreate);
+
+        // then
+        assertEquals(1L, postRepository.count());
+
+        Post post = postRepository.findAll().get(0);
+        assertEquals("글 제목입니다.", post.getTitle());
+        assertEquals("글 내용입니다.", post.getContent());
+    }
+
+    @Test
+    @DisplayName("postId 로 글 조회")
+    void get_post_by_id_test() {
+        // given
+        Post post = Post.builder()
+                .title("글 제목입니다.")
+                .content("글 내용입니다.")
+                .build();
+
+        postRepository.save(post);
+
+        Long postId = 1L;
+
+        // when
+        Post postEntity = postService.getPost(postId);
+
+        // then
+        assertNotNull(post);
+        assertEquals("글 제목입니다.", postEntity.getTitle());
+        assertEquals("글 내용입니다.", postEntity.getContent());
+    }
+}