43 lines
1.3 KiB
JavaScript
43 lines
1.3 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: --harmony-species --allow-natives-syntax
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// Test that Promises use @@species appropriately
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// Another constructor with no species will not be instantiated
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var test = new Promise(function(){});
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var bogoCount = 0;
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function bogusConstructor() { bogoCount++; }
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test.constructor = bogusConstructor;
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assertTrue(Promise.resolve(test) instanceof Promise);
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assertFalse(Promise.resolve(test) instanceof bogusConstructor);
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// Tests that chromium:575314 is fixed thoroughly
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Promise.resolve(test).catch(e => %AbortJS("Error " + e)).then(() => {
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if (bogoCount != 0) %AbortJS("bogoCount was " + bogoCount + " should be 0");
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});
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// If there is a species, it will be instantiated
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// @@species will be read exactly once, and the constructor is called with a
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// function
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var count = 0;
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var params;
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class MyPromise extends Promise {
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constructor(...args) {
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super(...args);
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params = args;
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}
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static get [Symbol.species]() {
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count++
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return this;
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}
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}
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var myPromise = MyPromise.resolve().then();
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assertEquals(1, count);
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assertEquals(1, params.length);
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assertEquals('function', typeof(params[0]));
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assertTrue(myPromise instanceof MyPromise);
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assertTrue(myPromise instanceof Promise);
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