Question: Can I fetch the Router-level middleware function from the Server object (application level)
I want to get the call to middleware function from the server object that I create last in the code. How can I achieve that? It seems like there is not a lot of information out there. My goal is to extract the middleware functions and keep a index for all the calls. When I test the application, I do not have to actually call through the http requests.

```js
const app = new Koa();
  const router = new Router();

  async function middleware(context: Koa.Context) {
    // the client is requesting a specific statusCode to be returned
    if (context.query.status !== undefined) {
      context.status = parseInt(context.query.status, 10);
      if (context.query.body !== undefined) {
        try {
          context.body = JSON.parse(context.query.body);
        } catch (e) {
          context.body = context.query.body;
        }
      }
      return;
    }
    // put all the inbound x-headers in the response, prepended with 'ping.'
    Object.keys(context.headers).forEach(header => {
      if (header.toLowerCase().startsWith('x-')) {
        context.response.set(`x-ping-${header.slice(2)}`, context.headers[header]);
      }
    });

    context.body = {
      ping: (context.request as any).body
    };
    context.status = 200;
  }
  router.head('/ping', middleware);
  router.get('/ping', middleware);
  router.del('/ping', middleware);
  router.put('/ping', middleware);
  router.post('/ping', middleware);
  router.patch('/ping', middleware);

  app.use(koaBody());
  app.use(router.routes());
  app.use(router.allowedMethods());

  const port = await findPort();
  const server = app.listen(port);


```


