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219bdc6f73
Add tests that assert behavior when a Promise is resolved with another Promise whose `then` method has been overridden. Because all objects with a `then` method are treated equivalently, the presence of a [[PromiseState]] internal slot should have no effect on program behavior. These tests guard against a faulty optimization originally implemented in V8: https://bugs.chromium.org/p/v8/issues/detail?id=3641
49 lines
1.3 KiB
JavaScript
49 lines
1.3 KiB
JavaScript
// Copyright (C) 2016 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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description: >
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Resolving with a resolved Promise instance whose `then` method has been
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overridden after execution of the executor function
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es6id: 25.4.3.1
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info: >
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[...]
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8. Let resolvingFunctions be CreateResolvingFunctions(promise).
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9. Let completion be Call(executor, undefined,
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«resolvingFunctions.[[Resolve]], resolvingFunctions.[[Reject]]»).
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25.4.1.3.2 Promise Resolve Functions
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[...]
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8. Let then be Get(resolution, "then").
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9. If then is an abrupt completion, then
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[...]
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10. Let thenAction be then.[[value]].
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11. If IsCallable(thenAction) is false, then
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[...]
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12. Perform EnqueueJob ("PromiseJobs", PromiseResolveThenableJob,
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«promise, resolution, thenAction»)
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---*/
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var value = {};
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var resolve;
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var thenable = new Promise(function(resolve) { resolve(); });
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var promise = new Promise(function(_resolve) {
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resolve = _resolve;
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});
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thenable.then = function(resolve) {
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resolve(value);
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};
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promise.then(function(val) {
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if (val !== value) {
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$DONE('The promise should be fulfilled with the provided value.');
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return;
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}
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$DONE();
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}, function() {
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$DONE('The promise should not be rejected.');
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});
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resolve(thenable);
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