Adding an Express.router() REST endpoint in Apollo Server backend? (for e2e tests cleanup)

Is it possible to add an extra endpoint in an Apollo Server backend (besides the existing /graphql endpoint) using Express.router() or some built in Apollo function?

I have tried to add something like this but the route does not seem to be working:

// controllers/testing
import express from 'express';
import resetDatabase from '../database/resetDB';

const router = express.Router();

router.post('/reset', async (_request, response) => {
  await resetDatabase();    
  response.status(204).end();
});

export default router;

And then add the route in index where Apollo Server is created:

// index.ts
import testingRouter from './controllers/testing';

// ...

  if (process.env.NODE_ENV === 'test') {
    app.use('/api/testing', testingRouter);
  }

For the record, I am trying to do this to provide my Cypress e2e tests in an Apollo Client frontend with an endpoint to reset a testing database after running tests, if there is a better way of doing this, feel free to disregard my question and point me to the righteous path =)