feat: implement medal feature

backend/src/test/java/com/openisle/controller/MedalControllerTest.java

@@ -0,0 +1,52 @@
+package com.openisle.controller;
+
+import com.openisle.dto.CommentMedalDto;
+import com.openisle.model.MedalType;
+import com.openisle.service.MedalService;
+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.test.web.servlet.MockMvc;
+
+import java.util.List;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@WebMvcTest(MedalController.class)
+@AutoConfigureMockMvc(addFilters = false)
+class MedalControllerTest {
+    @Autowired
+    private MockMvc mockMvc;
+
+    @MockBean
+    private MedalService medalService;
+
+    @Test
+    void listMedals() throws Exception {
+        CommentMedalDto medal = new CommentMedalDto();
+        medal.setTitle("评论达人");
+        medal.setType(MedalType.COMMENT);
+        Mockito.when(medalService.getMedals(null)).thenReturn(List.of(medal));
+
+        mockMvc.perform(get("/api/medals"))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$[0].title").value("评论达人"));
+    }
+
+    @Test
+    void listMedalsWithUser() throws Exception {
+        CommentMedalDto medal = new CommentMedalDto();
+        medal.setCompleted(true);
+        medal.setType(MedalType.COMMENT);
+        Mockito.when(medalService.getMedals(1L)).thenReturn(List.of(medal));
+
+        mockMvc.perform(get("/api/medals").param("userId", "1"))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$[0].completed").value(true));
+    }
+}