I tried to test my API using super test , but when I add a auth middleware , I don't know how to mock the middleware , here's my code.

authMiddleware.js

export const authMiddleware = async (req: RequestWithUser, res: Response, next: NextFunction) => {
  try {
    const Authorization = req.cookies['Authorization'] || req.header('Authorization').split('Bearer ')[1] || null;
    if (Authorization) {
      const secretKey: string = config.get('secretKey');
      const verificationResponse = (await jwt.verify(Authorization, secretKey)) as DataStoredInToken;
      console.log(verificationResponse);
      const userId = verificationResponse._id; 
      const findUser = await userModel.findById(userId);
      if (findUser) {
        req.user = findUser;
        next();
      } else {
        next(new HttpException(401, 'Wrong authentication token'));
      }
    } else {
      next(new HttpException(404, 'Authentication token missing'));
    }
  } catch (error) {
    next(new HttpException(401, 'Wrong authentication token'));
  }
};

describe('[GET] /users/:id', () => {
    it('response findOne User', async () => {
      const userId = 'qpwoeiruty';

      const usersRoute = new UsersRoute();
      const users = usersRoute.usersController.userService.users;

      users.findOne = jest.fn().mockReturnValue({
        _id: 'qpwoeiruty',
        email: 'a@email.com',
        isAdmin: false,
        password: await bcrypt.hash('q1w2e3r4!', 10),
      });

      (mongoose as any).connect = jest.fn();
      const app = new App([usersRoute]);
      return request(app.getServer()).get(`${usersRoute.path}/${userId}`).expect(200);
    });
  });

The above test failed duo to my request did not have authorization in header, and I think about set header , but when it comes to

const finder = await userModel.findById(userId);

this will fail since it is related to server action and real database , so I don't think that is the right way to write this test.

What I want to do is to mock my authMiddleware variable ,for example

const findUser = jest.fn().mockReturnValue(
  ....
)

so that the auth middleware can pass , what't the right way to do here?