jest test basic setup

backend/tests/setupTests.ts

@@ -0,0 +1,21 @@
+import { Server } from 'http';
+import main from '../src';
+import { describe, expect, it, beforeAll, afterAll } from '@jest/globals';
+import request from 'supertest';
+
+let server: Server;
+
+beforeAll(async () => {
+  server = await main;
+});
+
+afterAll(async () => {
+  server.close();
+});
+
+describe('Healthcheck endpoint', () => {
+  it('GET /healthcheck should return OK', async () => {
+    const res = await request(server).get('/healthcheck');
+    expect(res.status).toEqual(200);
+  });
+});