Below is my code:

server.js

const app = express();
app.listen(port, () => {
  logger.info(`App running on http://localhost:${port}`);
});

export default app;

test.js

import server from "../../src/index.js";

chai.use(chaiHttp);

describe("GET Balance API Tests", () => {
  beforeEach(() => {
    const userBalance = mockUserBalances;
  });

  it("should return correct value", async () => {
    const res = await chai.request(server).get("/balance/user-1");
    console.log(res.status);  // this correctly returns 200
    res.status.should.equal(200);  // this throws an error stating res is undefined
  });
});

What am I doing wrong here? Why is res always undefined whenever I try to make any assertion?