mirror of https://github.com/tc39/test262.git
61 lines
1.6 KiB
JavaScript
61 lines
1.6 KiB
JavaScript
// Copyright (C) 2020 Rick Waldron. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-performpromiserace
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description: >
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Promise.race does not prevent resolve from being called multiple times.
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info: |
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PerformPromiseRace
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Repeat,
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Let next be IteratorStep(iteratorRecord).
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If next is an abrupt completion, set iteratorRecord.[[Done]] to true.
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ReturnIfAbrupt(next).
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If next is false, then
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Set iteratorRecord.[[Done]] to true.
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Return resultCapability.[[Promise]].
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Let nextValue be IteratorValue(next).
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If nextValue is an abrupt completion, set iteratorRecord.[[Done]] to true.
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ReturnIfAbrupt(nextValue).
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Let nextPromise be ? Call(promiseResolve, constructor, « nextValue »).
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Perform ? Invoke(nextPromise, "then", « resultCapability.[[Resolve]], resultCapability.[[Reject]] »).
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includes: [promiseHelper.js]
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---*/
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let callCount = 0;
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let sequence = [];
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function Constructor(executor) {
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function resolve(value) {
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callCount += 1;
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sequence.push(value);
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}
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executor(resolve, Test262Error.thrower);
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}
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Constructor.resolve = function(v) {
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return v;
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};
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let pResolve;
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let a = {
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then(resolver, rejector) {
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pResolve = resolver;
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}
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};
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assert.sameValue(callCount, 0, 'callCount before call to race()');
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Promise.race.call(Constructor, [a]);
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assert.sameValue(callCount, 0, 'callCount after call to race()');
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pResolve(1);
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pResolve(2);
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pResolve(3);
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assert.sameValue(callCount, 3, 'callCount after resolving a');
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assert.sameValue(sequence.length, 3);
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checkSequence(sequence);
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