import pTimeout from 'p-timeout'; export default ({Assertion}, utils) => { utils.addProperty(Assertion.prototype, 'timeout', async function () { let timeouted = false; await pTimeout(this._obj, 150, () => { timeouted = true; }); return this.assert( timeouted, 'expected promise to timeout but it was resolved', 'expected promise not to timeout but it timed out' ); }); };