| // 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.i |
| of [[DefineOwnProperty]] permits setting a setter (if absent). |
| es5id: 15.2.3.6-4-19 |
| description: > |
| Object.defineProperty permits setting a setter (if absent) of |
| non-configurable accessor properties(8.12.9 step 10.a.ii.1) |
| ---*/ |
| |
| var o = {}; |
| |
| // create an accessor property; all other attributes default to false. |
| // dummy getter |
| var getter = function() { |
| return 1; |
| } |
| var d1 = { |
| get: getter |
| }; |
| Object.defineProperty(o, "foo", d1); |
| |
| // now, trying to set the setter should succeed even though [[Configurable]] |
| // on the original property will be false. |
| var desc = { |
| set: undefined |
| }; |
| Object.defineProperty(o, "foo", desc); |
| |
| var d2 = Object.getOwnPropertyDescriptor(o, "foo"); |
| |
| assert.sameValue(d2.get, getter, 'd2.get'); |
| assert.sameValue(d2.set, undefined, 'd2.set'); |
| assert.sameValue(d2.configurable, false, 'd2.configurable'); |
| assert.sameValue(d2.enumerable, false, 'd2.enumerable'); |