test262/test/built-ins/Object/defineProperty/15.2.3.6-4-20.js

// Copyright (c) 2012 Ecma International.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
info: >
    Step 4 of defineProperty calls the [[DefineOwnProperty]] internal method
    of O to define the property. For non-configurable properties, step 11.a.ii
    of [[DefineOwnProperty]] rejects changing the getter if present.
es5id: 15.2.3.6-4-20
description: >
    Object.defineProperty throws TypeError when changing getter (if
    present) of non-configurable accessor properties(8.12.9 step
    11.a.ii)
includes: [runTestCase.js]
---*/

function testcase() {
  var o = {};

  // create an accessor property; all other attributes default to false.
  // dummy getter/setter
  var getter = function () { return 1;}
  var d1 = { get: getter, configurable: false };
  Object.defineProperty(o, "foo", d1);

  // now, trying to change the setter should fail, since [[Configurable]]
  // on the original property will be false.
  var desc = { get: undefined };

  try {
    Object.defineProperty(o, "foo", desc);
  }
  catch (e) {
    if (e instanceof TypeError) {
      var d2 = Object.getOwnPropertyDescriptor(o, "foo");

      if (d2.get === getter &&
	      d2.configurable === false &&
          d2.enumerable === false) {
        return true;
      }
    }
  }
 }
runTestCase(testcase);