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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/chapter15/15.2/15.2.3/15.2.3.6/15.2.3.6-4-5.js",
33 description: "Object.defineProperty is no-op if current and desc are the same data desc",
35 test: function testcase() {
36 function sameDataDescriptorValues(d1, d2) {
37 return (d1.value === d2.value &&
38 d1.enumerable === d2.enumerable &&
39 d1.writable === d2.writable &&
40 d1.configurable === d2.configurable);
45 // create a data valued property with the following attributes:
46 // value: 101, enumerable: true, writable: true, configurable: true
49 // query for, and save, the desc. A subsequent call to defineProperty
50 // with the same desc should not disturb the property definition.
51 var d1 = Object.getOwnPropertyDescriptor(o, "foo");
53 // now, redefine the property with the same descriptor
54 // the property defintion should not get disturbed.
55 var desc = { value: 101, enumerable: true, writable: true, configurable: true };
56 Object.defineProperty(o, "foo", desc);
58 var d2 = Object.getOwnPropertyDescriptor(o, "foo");
60 if (sameDataDescriptorValues(d1, d2) === true) {
65 precondition: function prereq() {
66 return fnExists(Object.defineProperty) && fnExists(Object.getOwnPropertyDescriptor);