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22 Step 4 of defineProperty calls the [[DefineOwnProperty]] internal method
23 of O to define the property. Step 6 of [[DefineOwnProperty]] returns if
24 every field of desc also occurs in current and every field in desc has
25 the same value as current.
28 ES5Harness.registerTest( {
31 path: "TestCases/chapter15/15.2/15.2.3/15.2.3.6/15.2.3.6-4-6.js",
33 description: "Object.defineProperty is no-op if current and desc are the same accessor desc",
35 test: function testcase() {
36 function sameAccessorDescriptorValues(d1, d2) {
37 return (d1.get == d2.get &&
38 d1.enumerable == d2.enumerable &&
39 d1.configurable == d2.configurable);
44 // create an accessor property with the following attributes:
45 // enumerable: true, configurable: true
52 Object.defineProperty(o, "foo", desc);
54 // query for, and save, the desc. A subsequent call to defineProperty
55 // with the same desc should not disturb the property definition.
56 var d1 = Object.getOwnPropertyDescriptor(o, "foo");
58 // now, redefine the property with the same descriptor
59 // the property defintion should not get disturbed.
60 Object.defineProperty(o, "foo", desc);
62 var d2 = Object.getOwnPropertyDescriptor(o, "foo");
64 if (sameAccessorDescriptorValues(d1, d2) === true) {
69 precondition: function prereq() {
70 return fnExists(Object.defineProperty) && fnExists(Object.getOwnPropertyDescriptor);