// 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. Step 7b of [[DefineOwnProperty]] rejects if
    current.[[Enumerable]] and desc.[[Enumerable]] are the boolean negations
    of each other.
es5id: 15.2.3.6-4-9
description: >
    Object.defineProperty throws TypeError when changing
    [[Enumerable]] from true to false on non-configurable data
    properties
---*/

  var o = {};

  // create a data valued property with [[Enumerable]] explicitly set to true;
  // all other attributes default to false.
  var d1 = { value: 101, enumerable: true, configurable: false };
  Object.defineProperty(o, "foo", d1);

  // now, setting enumerable to false should fail, since [[Configurable]]
  // on the original property will be false.
  var desc = { value: 101, enumerable: false };
assert.throws(TypeError, function() {
    Object.defineProperty(o, "foo", desc);
});
      // the property should remain unchanged.
      var d2 = Object.getOwnPropertyDescriptor(o, "foo");
assert.sameValue(d2.value, 101, 'd2.value');
assert.sameValue(d2.enumerable, true, 'd2.enumerable');
assert.sameValue(d2.configurable, false, 'd2.configurable');

reportCompare(0, 0);
