diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/Object/15.2.3.12.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/Object/15.2.3.12.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,46 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+/* Object.isFrozen */
+
+assertEq(Object.isFrozen({}), false);
+
+assertEq(Object.isFrozen(Object.preventExtensions({})), true);
+
+var o = Object.defineProperty({}, 'x', { writable:true, configurable:true });
+Object.preventExtensions(o);
+assertEq(Object.isFrozen(o), false);
+
+var o = Object.defineProperty({}, 'x', { writable:false, configurable:true });
+Object.preventExtensions(o);
+assertEq(Object.isFrozen(o), false);
+
+var o = Object.defineProperty({}, 'x', { writable:true, configurable:false });
+Object.preventExtensions(o);
+assertEq(Object.isFrozen(o), false);
+
+var o = Object.defineProperty({}, 'x', { writable:false, configurable:false });
+assertEq(Object.isFrozen(o), false);
+
+var o = Object.defineProperty({}, 'x', { writable:false, configurable:false });
+Object.preventExtensions(o);
+assertEq(Object.isFrozen(o), true);
+
+var o = Object.defineProperties({}, { x: { writable:true,  configurable:true },
+                                      y: { writable:false, configurable:false } });
+Object.preventExtensions(o);
+assertEq(Object.isFrozen(o), false);
+
+var o = Object.defineProperties({}, { x: { writable:false, configurable:false },
+                                      y: { writable:true,  configurable:true } });
+Object.preventExtensions(o);
+assertEq(Object.isFrozen(o), false);
+
+var o = Object.defineProperties({}, { x: { writable:true,  configurable:true },
+                                      y: { writable:true,  configurable:true } });
+Object.preventExtensions(o);
+assertEq(Object.isFrozen(o), false);
+
+reportCompare(true, true);