mirror of https://github.com/tc39/test262.git
51 lines
1.2 KiB
JavaScript
51 lines
1.2 KiB
JavaScript
// Copyright 2018 the V8 project authors. 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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author: Maya Lekova <mslekova@chromium.org>
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esid: await
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description: >
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This test demonstrates that monkey-patched "then" on native promises will
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not get called. Adapted from example by Kevin Smith:
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https://github.com/tc39/ecma262/pull/1250#issuecomment-401082195
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flags: [async]
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features: [async-functions]
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includes: [compareArray.js]
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---*/
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let thenCallCount = 0;
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const value = 42;
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const actual = [];
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const expected = [
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'Promise: 1',
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'Await: ' + value,
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'Promise: 2',
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];
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const patched = Promise.resolve(value);
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patched.then = function(...args) {
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thenCallCount++;
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Promise.prototype.then.apply(this, args);
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};
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async function trigger() {
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actual.push('Await: ' + await patched);
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}
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function checkAssertions() {
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assert.compareArray(actual, expected,
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'Async/await and promises should be interleaved');
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assert.sameValue(thenCallCount, 0,
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'Monkey-patched "then" on native promises should not be called.')
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}
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trigger().then(checkAssertions).then($DONE, $DONE);
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new Promise(function (resolve) {
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actual.push('Promise: 1');
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resolve();
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}).then(function () {
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actual.push('Promise: 2');
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});
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