mirror of https://github.com/tc39/test262.git
42 lines
1010 B
JavaScript
42 lines
1010 B
JavaScript
// Copyright (C) 2019 Leo Balter. 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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description: >
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Gets constructor's `resolve` method once from zero to many invocations.
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esid: sec-promise.race
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info: |
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Runtime Semantics: PerformPromiseRace
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1. Let promiseResolve be ? Get(constructor, `"resolve"`).
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1. If IsCallable(promiseResolve) is false, throw a TypeError exception.
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...
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1. Repeat,
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...
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1. Let nextPromise be ? Call(promiseResolve, constructor, « nextValue »).
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---*/
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var resolve = Promise.resolve;
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var getCount = 0;
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var callCount = 0;
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Object.defineProperty(Promise, 'resolve', {
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configurable: true,
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get() {
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getCount += 1;
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return function() {
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callCount += 1;
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return resolve.apply(Promise, arguments);
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};
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}
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});
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Promise.race([]);
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assert.sameValue(
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getCount, 1, 'Got `resolve` only once for each iterated value'
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);
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assert.sameValue(
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callCount, 0, '`resolve` not called for empty iterator'
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);
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