JSTests/test262/test/language/arguments-object/mapped/nonconfigurable-nonenumerable-nonwritable-descriptors-set-by-arguments.js

// 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 to non-configurable, non-enumerable and non-writable
info: |
    Change the descriptor using [[DefineOwnProperty]] to {configurable: false, enumerable: false},
    set arguments[0] = 2 and then change property descriptor to {writable: false}.
    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});
  arguments[0] = 2;
  Object.defineProperty(arguments, "0", {writable: false});

  let propertyDescriptor = Object.getOwnPropertyDescriptor(arguments, "0");
  assert.sameValue(propertyDescriptor.value, 2);
  assert.sameValue(a, 2);
  verifyNotEnumerable(arguments, "0");
  verifyNotWritable(arguments, "0");
  verifyNotConfigurable(arguments, "0");

  // Postcondition: Arguments mapping is removed.
  a = 3;
  propertyDescriptor = Object.getOwnPropertyDescriptor(arguments, "0");
  assert.sameValue(propertyDescriptor.value, 2);
  verifyNotEnumerable(arguments, "0");
  verifyNotWritable(arguments, "0");
  verifyNotConfigurable(arguments, "0");
}
fn(1);