diff -r 000000000000 -r 6474c204b198 testing/mochitest/tests/browser/browser_fail_unexpectedTimeout.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing/mochitest/tests/browser/browser_fail_unexpectedTimeout.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+function test() {
+  function message() {
+    info("This should delay timeout");
+  }
+  function end() {
+    ok(true, "Should have not timed out, but notified long running test");
+    finish();
+  }
+  waitForExplicitFinish();
+  setTimeout(message, 20000);
+  setTimeout(end, 40000);
+}