__proto__.js - mozsearch

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/*

 * Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/licenses/publicdomain/

*/

var gTestfile = '__proto__.js';

var BUGNUMBER = 770344;

var summary = "__proto__ as accessor";

print(BUGNUMBER + ": " + summary);

/**************

 * BEGIN TEST *

 **************/

var protoDesc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");

assertEq(protoDesc !== null, true);

assertEq(typeof protoDesc, "object");

assertEq(protoDesc.hasOwnProperty("get"), true);

assertEq(protoDesc.hasOwnProperty("set"), true);

assertEq(protoDesc.hasOwnProperty("enumerable"), true);

assertEq(protoDesc.hasOwnProperty("configurable"), true);

assertEq(protoDesc.hasOwnProperty("value"), false);

assertEq(protoDesc.hasOwnProperty("writable"), false);

assertEq(protoDesc.configurable, true);

assertEq(protoDesc.enumerable, false);

assertEq(typeof protoDesc.get, "function", protoDesc.get + "");

assertEq(typeof protoDesc.set, "function", protoDesc.set + "");

assertEq(delete Object.prototype.__proto__, true);

assertEq(Object.getOwnPropertyDescriptor(Object.prototype, "__proto__"),

         undefined);

var obj = {};

obj.__proto__ = 5;

assertEq(Object.getPrototypeOf(obj), Object.prototype);

assertEq(obj.hasOwnProperty("__proto__"), true);

var desc = Object.getOwnPropertyDescriptor(obj, "__proto__");

assertEq(desc !== null, true);

assertEq(typeof desc, "object");

assertEq(desc.value, 5);

assertEq(desc.writable, true);

assertEq(desc.enumerable, true);

assertEq(desc.configurable, true);

/******************************************************************************/

if (typeof reportCompare === "function")

  reportCompare(true, true);

print("Tests complete");