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function newPromiseCapability() {
var resolve, reject, promise = new Promise(function(r1, r2) {
resolve = r1;
reject = r2;
});
return {promise, resolve, reject};
}
function neverCalled() {
// Quit with non-zero exit code to ensure a test suite error is shown,
// even when this function is called within promise handlers which normally
// swallow any exceptions.
quit(1);
}
var {promise, resolve} = newPromiseCapability();
var getterCount = 0;
class P extends Promise {
constructor(executor) {
var {promise, resolve, reject} = newPromiseCapability();
executor(function(v) {
// Resolve the promise.
resolve(v);
// But then return an object from the resolve function. This object
// must be treated as the resolution value for the otherwise
// skipped promise which gets created when Promise.prototype.then is
// called in PerformPromiseRace.
return {
get then() {
getterCount++;
}
};
}, neverCalled);
return promise;
}
// Default to the standard Promise.resolve function, so we don't create
// another instance of this class when resolving the passed promise objects
// in Promise.race.
static resolve(v) {
return Promise.resolve(v);
}
}
P.race([promise]);
resolve(0);
drainJobQueue();
assertEq(getterCount, 1);
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