Add controller unit tests and test dependencies

src/test/java/com/openisle/controller/PostControllerTest.java

@@ -0,0 +1,75 @@
+package com.openisle.controller;
+
+import com.openisle.model.Post;
+import com.openisle.model.User;
+import com.openisle.service.PostService;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.test.web.servlet.MockMvc;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+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.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@WebMvcTest(PostController.class)
+@AutoConfigureMockMvc(addFilters = false)
+class PostControllerTest {
+    @Autowired
+    private MockMvc mockMvc;
+
+    @MockBean
+    private PostService postService;
+
+    @Test
+    void createAndGetPost() throws Exception {
+        User user = new User();
+        user.setUsername("alice");
+        Post post = new Post();
+        post.setId(1L);
+        post.setTitle("t");
+        post.setContent("c");
+        post.setCreatedAt(LocalDateTime.now());
+        post.setAuthor(user);
+        Mockito.when(postService.createPost(eq("alice"), eq("t"), eq("c"))).thenReturn(post);
+        Mockito.when(postService.getPost(1L)).thenReturn(post);
+
+        mockMvc.perform(post("/api/posts")
+                        .contentType("application/json")
+                        .content("{\"title\":\"t\",\"content\":\"c\"}")
+                        .principal(new UsernamePasswordAuthenticationToken("alice", "p")))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.title").value("t"));
+
+        mockMvc.perform(get("/api/posts/1"))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.id").value(1));
+    }
+
+    @Test
+    void listPosts() throws Exception {
+        User user = new User();
+        user.setUsername("bob");
+        Post post = new Post();
+        post.setId(2L);
+        post.setTitle("hello");
+        post.setContent("world");
+        post.setCreatedAt(LocalDateTime.now());
+        post.setAuthor(user);
+        Mockito.when(postService.listPosts()).thenReturn(List.of(post));
+
+        mockMvc.perform(get("/api/posts"))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$[0].title").value("hello"));
+    }
+}