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// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --allow-natives-syntax
// Test that Promises use @@species appropriately
// Another constructor with no species will not be instantiated
var test = new Promise(function(){});
var bogoCount = 0;
function bogusConstructor() { bogoCount++; }
test.constructor = bogusConstructor;
assertTrue(Promise.resolve(test) instanceof Promise);
assertFalse(Promise.resolve(test) instanceof bogusConstructor);
// Tests that chromium:575314 is fixed thoroughly
Promise.resolve(test).catch(e => %AbortJS("Error " + e)).then(() => {
if (bogoCount != 0) %AbortJS("bogoCount was " + bogoCount + " should be 0");
});
// If there is a species, it will be instantiated
// @@species will be read exactly once, and the constructor is called with a
// function
var count = 0;
var params;
class MyPromise extends Promise {
constructor(...args) {
super(...args);
params = args;
}
static get [Symbol.species]() {
count++
return this;
}
}
var myPromise = MyPromise.resolve().then();
assertEquals(1, count);
assertEquals(1, params.length);
assertEquals('function', typeof(params[0]));
assertTrue(myPromise instanceof MyPromise);
assertTrue(myPromise instanceof Promise);
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