diff -r 000000000000 -r 6474c204b198 dom/workers/test/rvals_worker.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/workers/test/rvals_worker.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+onmessage = function(evt) {
+  postMessage(postMessage('ignore') == undefined);
+
+  var id = setInterval(function() {}, 200);
+  postMessage(clearInterval(id) == undefined);
+
+  id = setTimeout(function() {}, 200);
+  postMessage(clearTimeout(id) == undefined);
+
+  postMessage(dump(42) == undefined);
+
+  postMessage('finished');
+}