feat: backend rebuild

backend/tests/health.test.js

@@ -0,0 +1,15 @@
+import app from "../src/index.js"; // สมมติว่าคุณ export app จาก src/index.js
+import request from "supertest";
+
+// ปิด server หลังจากเทสเสร็จ
+afterAll((done) => {
+  app.server.close(done);
+});
+
+describe("GET /health", () => {
+  it("should respond with 200 OK and a health message", async () => {
+    const response = await request(app).get("/health");
+    expect(response.statusCode).toBe(200);
+    expect(response.text).toContain("Backend is healthy");
+  });
+});