test262/test/built-ins/Object/getOwnPropertyDescriptors/observable-operations.js

// 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 perform observable operations in the correct order
id: pending
author: Jordan Harband
features: [Proxy]
---*/

var log = "";
var object = { a: 0, b: 0, c: 0 };
var handler = {
  get: function (target, propertyKey, receiver) {
    throw new Test262Error('no values should be retrieved via [[Get]]');
  },
  getOwnPropertyDescriptor: function (target, propertyKey) {
    assert.sameValue(target, object, "getOwnPropertyDescriptor");
    log += "|getOwnPropertyDescriptor:" + propertyKey;
    return Object.getOwnPropertyDescriptor(target, propertyKey);
  },
  ownKeys: function (target) {
    assert.sameValue(target, object, "ownKeys");
    log += "|ownKeys";
    return Object.getOwnPropertyNames(target);
  },
  deleteProperty: function (oTarget, sKey) {
    throw new Test262Error('properties should not be deleted');
  },
  defineProperty: function (oTarget, sKey, oDesc) {
    throw new Test262Error('properties should not be defined');
  },
  set: function (oTarget, sKey, vValue) {
    throw new Test262Error('properties should not be assigned');
  }
};
var check = {
  get: function (target, propertyKey, receiver) {
    assert(propertyKey in target, "handler check: " + propertyKey);
    return target[propertyKey];
  }
};
var proxy = new Proxy(object, new Proxy(handler, check));
var result = Object.getOwnPropertyDescriptors(proxy);
assert.sameValue(log, "|ownKeys|getOwnPropertyDescriptor:a|getOwnPropertyDescriptor:b|getOwnPropertyDescriptor:c", 'log');