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/room/route.test.ts

@@ -0,0 +1,66 @@
+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";
+import { TEST_USER, TEST_BLINDBOX_ROOM } from "@/__tests__/helpers/fixtures";
+
+vi.mock("@/lib/blindbox", () => ({
+  generateUniqueRoomCode: vi.fn().mockResolvedValue("XYZ789"),
+}));
+
+import { POST } from "./route";
+
+const mockCtx = { params: Promise.resolve({}) };
+
+beforeEach(() => {
+  resetPrismaMock();
+});
+
+describe("POST /api/blindbox/room", () => {
+  it("creates a blindbox room", async () => {
+    prismaMock.user.findUnique.mockResolvedValue(TEST_USER as never);
+    prismaMock.blindBoxRoom.create.mockResolvedValue({
+      ...TEST_BLINDBOX_ROOM,
+      code: "XYZ789",
+    } as never);
+
+    const req = createRequest("/api/blindbox/room", {
+      method: "POST",
+      body: { userId: "user-1", name: "周末计划" },
+    });
+    const res = await POST(req, mockCtx);
+    const { status, data } = await parseJsonResponse(res);
+
+    expect(status).toBe(201);
+    expect(data.code).toBe("XYZ789");
+  });
+
+  it("uses default room name when not provided", async () => {
+    prismaMock.user.findUnique.mockResolvedValue(TEST_USER as never);
+    prismaMock.blindBoxRoom.create.mockResolvedValue(TEST_BLINDBOX_ROOM as never);
+
+    const req = createRequest("/api/blindbox/room", {
+      method: "POST",
+      body: { userId: "user-1" },
+    });
+    const res = await POST(req, mockCtx);
+    expect(res.status).toBe(201);
+  });
+
+  it("returns 401 when no userId", async () => {
+    const req = createRequest("/api/blindbox/room", {
+      method: "POST",
+      body: { name: "test" },
+    });
+    const res = await POST(req, mockCtx);
+    expect(res.status).toBe(401);
+  });
+
+  it("returns 400 when room name too long", async () => {
+    const req = createRequest("/api/blindbox/room", {
+      method: "POST",
+      body: { userId: "user-1", name: "a".repeat(31) },
+    });
+    const res = await POST(req, mockCtx);
+    expect(res.status).toBe(400);
+  });
+});