diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Object-defineProperty-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Object-defineProperty-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+// obj.defineProperty can define simple data properties.
+
+var g = newGlobal();
+var dbg = new Debugger;
+var gobj = dbg.addDebuggee(g);
+gobj.defineProperty("x", {configurable: true, enumerable: true, writable: true, value: 'ok'});
+assertEq(g.x, 'ok');
+
+var desc = g.Object.getOwnPropertyDescriptor(g, "x");
+assertEq(desc.configurable, true);
+assertEq(desc.enumerable, true);
+assertEq(desc.writable, true);