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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.
// Test the ES2015 @@species feature
'use strict';
let TypedArray = Uint8Array.__proto__;
// The @@species property exists on the right objects and has the right values
let classesWithSpecies = [RegExp, Array, TypedArray, ArrayBuffer, Map, Set, Promise];
let classesWithoutSpecies = [Object, Function, String, Number, Symbol, WeakMap, WeakSet];
for (let constructor of classesWithSpecies) {
assertEquals(constructor, constructor[Symbol.species]);
assertThrows(function() { constructor[Symbol.species] = undefined }, TypeError);
let descriptor = Object.getOwnPropertyDescriptor(constructor, Symbol.species);
assertTrue(descriptor.configurable);
assertFalse(descriptor.enumerable);
assertEquals(undefined, descriptor.writable);
assertEquals(undefined, descriptor.set);
assertEquals('function', typeof descriptor.get);
}
// @@species is defined with distinct getters
assertEquals(classesWithSpecies.length,
new Set(classesWithSpecies.map(constructor =>
Object.getOwnPropertyDescriptor(
constructor, Symbol.species).get)
).size);
for (let constructor of classesWithoutSpecies)
assertEquals(undefined, constructor[Symbol.species]);