1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Object/defineProperty/15.2.3.6-4-5.js b/js/src/tests/test262/built-ins/Object/defineProperty/15.2.3.6-4-5.js
new file mode 100644
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+++ b/js/src/tests/test262/built-ins/Object/defineProperty/15.2.3.6-4-5.js
@@ -0,0 +1,47 @@
+// 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 6 of [[DefineOwnProperty]] returns if
+    every field of desc also occurs in current and every field in desc has
+    the same value as current.
+es5id: 15.2.3.6-4-5
+description: >
+    Object.defineProperty is no-op if current and desc are the same
+    data desc
+---*/
+
+function sameDataDescriptorValues(d1, d2) {
+  return (d1.value === d2.value &&
+    d1.enumerable === d2.enumerable &&
+    d1.writable === d2.writable &&
+    d1.configurable === d2.configurable);
+}
+
+var o = {};
+
+// create a data valued property with the following attributes:
+// value: 101, enumerable: true, writable: true, configurable: true
+o["foo"] = 101;
+
+// query for, and save, the desc. A subsequent call to defineProperty
+// with the same desc should not disturb the property definition.
+var d1 = Object.getOwnPropertyDescriptor(o, "foo");
+
+// now, redefine the property with the same descriptor
+// the property defintion should not get disturbed.
+var desc = {
+  value: 101,
+  enumerable: true,
+  writable: true,
+  configurable: true
+};
+Object.defineProperty(o, "foo", desc);
+
+var d2 = Object.getOwnPropertyDescriptor(o, "foo");
+
+assert.sameValue(sameDataDescriptorValues(d1, d2), true, 'sameDataDescriptorValues(d1, d2)');
+
+reportCompare(0, 0);