diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/proxy/testDirectProxyDefineProperty2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/proxy/testDirectProxyDefineProperty2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,35 @@
+/*
+ * Call the trap with the handler as the this value, the target as the first
+ * argument, the name of the property as the second argument, and the descriptor
+ * as the third argument.
+ */
+var target = {};
+var called = false;
+var handler = {
+    defineProperty: function (target1, name, desc1) {
+        assertEq(this, handler);
+        assertEq(target1, target);
+        assertEq(name, 'foo');
+        assertEq(desc1 == desc, false);
+        assertEq(desc1.value, 'bar');
+        assertEq(desc1.writable, true);
+        assertEq(desc1.enumerable, false);
+        assertEq(desc1.configurable, true);
+        called = true;
+    }
+}
+var desc = {
+    value: 'bar',
+    writable: true,
+    enumerable: false,
+    configurable: true
+};
+
+var p = new Proxy(target, handler);
+Object.defineProperty(p, 'foo', desc);
+assertEq(called, true);
+assertEq(Object.isExtensible(target), true);
+assertEq(Object.isExtensible(p), true);
+Object.preventExtensions(target);
+assertEq(Object.isExtensible(target), false);
+assertEq(Object.isExtensible(p), false);