Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 5 | // Flags: --allow-natives-syntax |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 6 | |
| 7 | // Test that Promises use @@species appropriately |
| 8 | |
| 9 | // Another constructor with no species will not be instantiated |
| 10 | var test = new Promise(function(){}); |
| 11 | var bogoCount = 0; |
| 12 | function bogusConstructor() { bogoCount++; } |
| 13 | test.constructor = bogusConstructor; |
| 14 | assertTrue(Promise.resolve(test) instanceof Promise); |
| 15 | assertFalse(Promise.resolve(test) instanceof bogusConstructor); |
| 16 | // Tests that chromium:575314 is fixed thoroughly |
| 17 | Promise.resolve(test).catch(e => %AbortJS("Error " + e)).then(() => { |
| 18 | if (bogoCount != 0) %AbortJS("bogoCount was " + bogoCount + " should be 0"); |
| 19 | }); |
| 20 | |
| 21 | // If there is a species, it will be instantiated |
| 22 | // @@species will be read exactly once, and the constructor is called with a |
| 23 | // function |
| 24 | var count = 0; |
| 25 | var params; |
| 26 | class MyPromise extends Promise { |
| 27 | constructor(...args) { |
| 28 | super(...args); |
| 29 | params = args; |
| 30 | } |
| 31 | static get [Symbol.species]() { |
| 32 | count++ |
| 33 | return this; |
| 34 | } |
| 35 | } |
| 36 | |
| 37 | var myPromise = MyPromise.resolve().then(); |
| 38 | assertEquals(1, count); |
| 39 | assertEquals(1, params.length); |
| 40 | assertEquals('function', typeof(params[0])); |
| 41 | assertTrue(myPromise instanceof MyPromise); |
| 42 | assertTrue(myPromise instanceof Promise); |