3bbd81afbc
Note that this also modifies mjsunit.js to allow the {failWithMessage} method to be monkey-patched by a test. This is necessary because assertions which fail in a promise's then-clause would normally only throw an exception, which is swallowed by the promise, causing the test to silently pass. Instead, patching this {failWithMessage} functionality allows then clauses to use the full assertion machinery of mjsunit.js.
R=ulan@chromium.org, gsathya@chromium.org
BUG=
Review-Url: https://codereview.chromium.org/2752043002
Cr-Commit-Position: refs/heads/master@{#43875}
51 lines
1.4 KiB
JavaScript
51 lines
1.4 KiB
JavaScript
// Copyright 2017 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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// We have to patch mjsunit because normal assertion failures just throw
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// exceptions which are swallowed in a then clause.
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failWithMessage = (msg) => %AbortJS(msg);
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let decrement = () => { %DecrementWaitCount(); }
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let increment = () => { %IncrementWaitCount(); }
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function WaitForPromise(p) {
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increment();
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p.then(decrement, decrement);
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}
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function newPromise() {
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var outerResolve;
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var outerReject;
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let promise = new Promise((resolve, reject) => {
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outerResolve = resolve;
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outerReject = reject;
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});
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WaitForPromise(promise); // explicitly wait for promise to resolve.
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return {
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resolve: outerResolve,
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reject: outerReject,
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then: (f, g) => promise.then(f, g)
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};
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}
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(function ResolveOK() {
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let promise = newPromise();
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promise.then(msg => {print("resolved: " + msg); assertEquals("ok", msg); },
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ex => {print("rejected: " + ex); %AbortJS("" + ex); });
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promise.resolve("ok");
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promise.reject(11); // ignored
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})();
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(function RejectOK() {
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let promise = newPromise();
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promise.then(msg => {print("resolved: " + msg); %AbortJS("fail"); },
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ex => {print("rejected: " + ex); assertEquals(42, ex); });
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promise.reject(42);
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promise.resolve("fail"); // ignored
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})();
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