JSTests/test262/test/built-ins/Proxy/ownKeys/not-extensible-return-keys.js

// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-proxy-object-internal-methods-and-internal-slots-ownpropertykeys
description: >
    If target is not extensible, the result must contain all the keys of the own
    properties of the target object and no other values
info: |
    [[OwnPropertyKeys]] ( )

    ...
    21. Return trapResult.
features: [Proxy]
---*/

var target = {
  foo: 1,
  bar: 2
};

var p = new Proxy(target, {
  ownKeys: function() {
    return ["foo", "bar"];
  }
});

Object.preventExtensions(target);

var keys = Object.getOwnPropertyNames(p);

assert.sameValue(keys[0], "foo");
assert.sameValue(keys[1], "bar");

assert.sameValue(keys.length, 2);