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Diffstat (limited to 'deps/v8/test/mjsunit/es6/promise-species.js')
-rw-r--r-- | deps/v8/test/mjsunit/es6/promise-species.js | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/es6/promise-species.js b/deps/v8/test/mjsunit/es6/promise-species.js new file mode 100644 index 0000000000..f6f2e7a1b5 --- /dev/null +++ b/deps/v8/test/mjsunit/es6/promise-species.js @@ -0,0 +1,42 @@ +// 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); |