js/src/tests/test262/language/arguments-object/mapped/nonconfigurable-nonenumerable-nonwritable-descriptors-basic.js


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

// Copyright (C) 2017 Caio Lima. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
description: Mapped arguments property descriptor change with non-configurable, non-enumerable and non-writable property
info: |
    Mapping stop working when property is set to non-writable. The
    descriptor's enumerable property is the one set before the mapping removal.
flags: [noStrict]
esid: sec-arguments-exotic-objects-defineownproperty-p-desc
includes: [propertyHelper.js]
---*/

function fn(a) {
  Object.defineProperty(arguments, "0", {configurable: false, enumerable: false, writable: false});

  // Postcondition: Arguments mapping is removed.
  a = 2;

  let propertyDescriptor = Object.getOwnPropertyDescriptor(arguments, "0");
  assert.sameValue(propertyDescriptor.value, 1);
  verifyNotEnumerable(arguments, "0");
  verifyNotWritable(arguments, "0");
  verifyNotConfigurable(arguments, "0");
}
fn(1);


reportCompare(0, 0);