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
5// Flags: --harmony-species
6
7// Test the ES2015 @@species feature
8
9'use strict';
10
11let TypedArray = Uint8Array.__proto__;
12
13// The @@species property exists on the right objects and has the right values
14
15let classesWithSpecies = [RegExp, Array, TypedArray, ArrayBuffer, Map, Set, Promise];
16let classesWithoutSpecies = [Object, Function, String, Number, Symbol, WeakMap, WeakSet];
17
18for (let constructor of classesWithSpecies) {
19  assertEquals(constructor, constructor[Symbol.species]);
20  assertThrows(function() { constructor[Symbol.species] = undefined }, TypeError);
21  let descriptor = Object.getOwnPropertyDescriptor(constructor, Symbol.species);
22  assertTrue(descriptor.configurable);
23  assertFalse(descriptor.enumerable);
24  assertEquals(undefined, descriptor.writable);
25  assertEquals(undefined, descriptor.set);
26  assertEquals('function', typeof descriptor.get);
27}
28
29// @@species is defined with distinct getters
30assertEquals(classesWithSpecies.length,
31             new Set(classesWithSpecies.map(constructor =>
32                                            Object.getOwnPropertyDescriptor(
33                                              constructor, Symbol.species).get)
34                ).size);
35
36for (let constructor of classesWithoutSpecies)
37  assertEquals(undefined, constructor[Symbol.species]);
38