test: 添加完整测试套件（52 个文件，326 个用例）

基于 Vitest 搭建测试基础设施，覆盖后端纯函数、API 路由、
前端 hooks、UI 组件和页面级集成测试。

src/app/api/blindbox/suggest/route.test.ts

@@ -0,0 +1,56 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { prismaMock, resetPrismaMock } from "@/__tests__/helpers/prisma-mock";
+import { createRequest, parseJsonResponse } from "@/__tests__/helpers/api-test-utils";
+
+vi.mock("@/lib/blindbox", () => ({
+  requireMembership: vi.fn().mockResolvedValue({}),
+}));
+
+vi.mock("@/lib/ai", () => ({
+  suggestIdeas: vi.fn().mockResolvedValue(["去爬山", "骑自行车", "看日出", "野餐"]),
+}));
+
+import { GET } from "./route";
+
+const mockCtx = { params: Promise.resolve({}) };
+
+beforeEach(() => {
+  resetPrismaMock();
+});
+
+describe("GET /api/blindbox/suggest", () => {
+  it("returns AI suggestions when enough ideas exist", async () => {
+    prismaMock.blindBoxIdea.findMany.mockResolvedValue([
+      { content: "去公园" },
+      { content: "看电影" },
+      { content: "吃火锅" },
+    ] as never);
+
+    const req = createRequest("/api/blindbox/suggest?roomId=bb-room-1&userId=user-1");
+    const res = await GET(req, mockCtx);
+    const { status, data } = await parseJsonResponse(res);
+
+    expect(status).toBe(200);
+    expect(data.suggestions).toHaveLength(4);
+    expect(data.source).toBe("ai");
+  });
+
+  it("returns empty when less than 2 ideas", async () => {
+    prismaMock.blindBoxIdea.findMany.mockResolvedValue([
+      { content: "去公园" },
+    ] as never);
+
+    const req = createRequest("/api/blindbox/suggest?roomId=bb-room-1&userId=user-1");
+    const res = await GET(req, mockCtx);
+    const { data } = await parseJsonResponse(res);
+
+    expect(data.suggestions).toHaveLength(0);
+    expect(data.source).toBe("none");
+  });
+
+  it("returns 400 when roomId missing", async () => {
+    const req = createRequest("/api/blindbox/suggest?userId=user-1");
+    const res = await GET(req, mockCtx);
+    expect(res.status).toBe(400);
+  });
+});