ownkeys-trap-duplicates.js

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/*

 * Any copyright is dedicated to the Public Domain.

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

*/

var gTestfile = 'ownkeys-trap-duplicates.js';

var BUGNUMBER = 1293995;

var summary =

  "Scripted proxies' [[OwnPropertyKeys]] should not throw if the trap " +

  "implementation returns duplicate properties and the object is " +

  "non-extensible or has non-configurable properties." +

  "Revised (bug 1389752): Throw TypeError for duplicate properties.";

print(BUGNUMBER + ": " + summary);

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

 * BEGIN TEST *

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

var target = Object.preventExtensions({ a: 1 });

var proxy = new Proxy(target, { ownKeys(t) { return ["a", "a"]; } });

assertThrowsInstanceOf(() => Object.getOwnPropertyNames(proxy), TypeError);

target = Object.freeze({ a: 1 });

proxy = new Proxy(target, { ownKeys(t) { return ["a", "a"]; } });

assertThrowsInstanceOf(() => Object.getOwnPropertyNames(proxy), TypeError);

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

if (typeof reportCompare === "function")

  reportCompare(true, true);

print("Tests complete");