57 lines
1.5 KiB
JavaScript
57 lines
1.5 KiB
JavaScript
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// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --allow-natives-syntax
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// If a Promise's then method is overridden, that should be respected
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// even if the promise is already resolved. x's resolution function is
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// only called by Promise.resolve(); there shouldn't be a resolution
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// check before when calling x.then.
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// Async assert framework copied from mjsunit/es6/promises.js
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var asyncAssertsExpected = 0;
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function assertAsyncRan() { ++asyncAssertsExpected }
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function assertLater(f, name) {
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assertFalse(f()); // should not be true synchronously
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++asyncAssertsExpected;
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var iterations = 0;
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function runAssertion() {
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if (f()) {
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print(name, "succeeded");
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--asyncAssertsExpected;
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} else if (iterations++ < 10) {
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%EnqueueMicrotask(runAssertion);
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} else {
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%AbortJS(name + " FAILED!");
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}
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}
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%EnqueueMicrotask(runAssertion);
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}
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function assertAsyncDone(iteration) {
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var iteration = iteration || 0;
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%EnqueueMicrotask(function() {
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if (asyncAssertsExpected === 0)
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assertAsync(true, "all")
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else if (iteration > 10) // Shouldn't take more.
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assertAsync(false, "all... " + asyncAssertsExpected)
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else
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assertAsyncDone(iteration + 1)
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});
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}
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// End async assert framework
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var y;
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var x = Promise.resolve();
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x.then = () => { y = true; }
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Promise.resolve().then(() => x);
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assertLater(() => y === true, "y === true");
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assertAsyncDone();
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