proxy-undefined-descriptor.js

Enable keyboard shortcuts

// Copyright (C) 2016 Jordan Harband. All rights reserved.

// This code is governed by the BSD license found in the LICENSE file.

/*---

description: Object.getOwnPropertyDescriptors should filter out undefined OwnPropertyDescriptors

esid: sec-object.getownpropertydescriptors

author: Jordan Harband

features: [Proxy]

includes: [proxyTrapsHelper.js]

---*/

var key = "a";

var ownKeys = [key];

var badProxyHandlers = allowProxyTraps({

  getOwnPropertyDescriptor: function() {},

  ownKeys: function() {

    return ownKeys;

});

var proxy = new Proxy({}, badProxyHandlers);

var keys = Reflect.ownKeys(proxy);

assert.notSameValue(keys, ownKeys, 'Object.keys returns a new Array');

assert.sameValue(Array.isArray(keys), true, 'Object.keys returns an Array');

assert.sameValue(keys.length, ownKeys.length, 'keys and ownKeys have the same length');

assert.sameValue(keys[0], ownKeys[0], 'keys and ownKeys have the same contents');

var descriptor = Object.getOwnPropertyDescriptor(proxy, key);

assert.sameValue(descriptor, undefined, "Descriptor matches result of [[GetOwnPropertyDescriptor]] trap");

var result = Object.getOwnPropertyDescriptors(proxy);

assert.sameValue(key in result, false, "key is not present in result");

reportCompare(0, 0);