let log = [];

let resolve;
const main = new Promise(r => { resolve = r });

(async function poll(count) {
  log.push(await Promise.resolve(count))
  if (count < 3) setTimeout(poll, 10, count + 1);
  else resolve();
})(0)

return main.then(() => {
  expect(log).toEqual([0, 1, 2, 3]);
});