promise-rejection-tracking.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);

// Unhandled rejections are tracked.

let reject;

let p = new Promise((res_, rej_) => (reject = rej_));

assertEq(rejections.has(p), false);

reject('reason');

assertEq(rejections.get(p), UNHANDLED);

// Later handling updates the tracking.

p.then(_=>_, _=>_);

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

rejections.clear();

// Handled rejections aren't tracked at all.

p = new Promise((res_, rej_) => (reject = rej_));

assertEq(rejections.has(p), false);

p.then(_=>_, _=>_);

reject('reason');

assertEq(rejections.has(p), false);

this.reportCompare && reportCompare(true,true);