diff -r 086c60adf08e -r 388e48c0a37a emul/src/main/java/java/lang/Class.java
--- a/emul/src/main/java/java/lang/Class.java	Tue Jan 15 09:32:11 2013 +0100
+++ b/emul/src/main/java/java/lang/Class.java	Wed Jan 23 20:16:48 2013 +0100
@@ -1198,7 +1198,8 @@
     )
     native static Class getPrimitiveClass(String type);
 
-    public boolean desiredAssertionStatus() {
-        return false;
-    }
+    @JavaScriptBody(args = {}, body = 
+        "return vm.desiredAssertionStatus ? vm.desiredAssertionStatus : false;"
+    )
+    public native boolean desiredAssertionStatus();
 }