// 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 10.a.i
    of [[DefineOwnProperty]] rejects if relaxing the [[Writable]] attribute.
es5id: 15.2.3.6-4-16
description: >
    Object.defineProperty throws TypeError when relaxing [[Writable]]
    on non-configurable data properties
---*/

  var o = {};

  // create a data valued property; all other attributes default to false.
  var d1 = { value: 101 };
  Object.defineProperty(o, "foo", d1);

  // now, relaxing [[Writable]] on "foo" should fail, since both
  // [[Configurable]] and [[Writable]] on the original property will be false.
  var desc = { value: 101, writable: true };
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.writable, false, 'd2.writable');
assert.sameValue(d2.enumerable, false, 'd2.enumerable');
assert.sameValue(d2.configurable, false, 'd2.configurable');