feat: add search module

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

@@ -0,0 +1,66 @@
+package com.openisle.controller;
+
+import com.openisle.model.Comment;
+import com.openisle.model.Post;
+import com.openisle.model.User;
+import com.openisle.model.PostStatus;
+import com.openisle.service.SearchService;
+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.*;
+
+@WebMvcTest(SearchController.class)
+@AutoConfigureMockMvc(addFilters = false)
+class SearchControllerTest {
+    @Autowired
+    private MockMvc mockMvc;
+
+    @MockBean
+    private SearchService searchService;
+
+    @Test
+    void userSearchEndpoint() throws Exception {
+        User user = new User();
+        user.setId(1L);
+        user.setUsername("alice");
+        Mockito.when(searchService.searchUsers("ali")).thenReturn(List.of(user));
+
+        mockMvc.perform(get("/api/search/users").param("keyword", "ali"))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$[0].username").value("alice"));
+    }
+
+    @Test
+    void globalSearchAggregatesTypes() throws Exception {
+        User u = new User();
+        u.setId(1L);
+        u.setUsername("bob");
+        Post p = new Post();
+        p.setId(2L);
+        p.setTitle("hello");
+        p.setStatus(PostStatus.PUBLISHED);
+        Comment c = new Comment();
+        c.setId(3L);
+        c.setContent("nice");
+        Mockito.when(searchService.globalSearch("n")).thenReturn(List.of(
+                new SearchService.SearchResult("user", 1L, "bob"),
+                new SearchService.SearchResult("post", 2L, "hello"),
+                new SearchService.SearchResult("comment", 3L, "nice")
+        ));
+
+        mockMvc.perform(get("/api/search/global").param("keyword", "n"))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$[0].type").value("user"))
+                .andExpect(jsonPath("$[1].type").value("post"))
+                .andExpect(jsonPath("$[2].type").value("comment"));
+    }
+}