it('return disl storage if content-length greater than 50000', () => {
   const req = {
     headers: {
       'content-length': 80000
     }
   };
   const storage = defaultGetStorage(createHttpContext(req as any));
   assert.ok(storage instanceof DiskStorage);
 });

 it('should process x-www-form-urlencoded', async function () {
   const req = new PassThrough();
   req.end('name=foo&key=value&abc=xyz');
   (req as any).headers = {
     'content-type': 'application/x-www-form-urlencoded',
     'content-length': 26
   };
   (req as any).method = 'GET';
   (req as any).url = '/upload';
   const ctx = W.createHttpContext(req as any);
   await T.toPromise(middleware(simpleApp)(ctx, T.pure));
   assert.deepEqual(ctx.state.body, {
     name: 'foo',
     key: 'value',
     abc: 'xyz'
   });
 });

    (form as any).getLength((err: Error | null, len: number) => {
      if (err) return cb(err);

      const app = mutter(simpleApp);
      const request = new PassThrough();
      (request as any).complete = false;
      form.once('end', () => {
        (request as any).complete = true;
      });

      form.pipe(request);
      (request as any).headers = {
        'content-type': 'multipart/form-data; boundary=' + (form as any).getBoundary(),
        'content-length': len
      };

      const ctx: W.HttpContext = W.createHttpContext(request as any);

      T.runTask(app(ctx, T.pure), err => {
        if (err) return cb(err);

        cb(null, ctx);
      });
    });

function request(app: Application, req: IncomingMessageMock): T.Task<Response> {
  return app(createHttpContext(req as any), T.pure);
}