promise-rejection-tracking-optimized.js

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// |reftest| skip-if(!xulRuntime.shell) -- needs setPromiseRejectionTrackerCallback

const UNHANDLED = 0;

const HANDLED   = 1;

let rejections = new Map();

function rejectionTracker(promise, state) {

  rejections.set(promise, state);

setPromiseRejectionTrackerCallback(rejectionTracker);

// If the return value of then is not used, the promise object is optimized

// away, but if a rejection happens, the rejection should be notified.

Promise.resolve().then(() => { throw 1; });

drainJobQueue();

assertEq(rejections.size, 1);

let [[promise, state]] = rejections;

assertEq(state, UNHANDLED);

let exc;

promise.catch(x => { exc = x; });

drainJobQueue();

// we handled it after all

assertEq(rejections.get(promise), HANDLED);

// the right exception was reported

assertEq(exc, 1);

if (this.reportCompare) {

  reportCompare(true,true);