diff -r 000000000000 -r 6474c204b198 testing/xpcshell/example/unit/test_execute_soon.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing/xpcshell/example/unit/test_execute_soon.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+/* vim:set ts=2 sw=2 sts=2 et: */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * ***** END LICENSE BLOCK ***** */
+
+var complete = false;
+
+function run_test() {
+  dump("Starting test\n");
+  do_register_cleanup(function() {
+    dump("Checking test completed\n");
+    do_check_true(complete);
+  });
+
+  do_execute_soon(function execute_soon_callback() {
+    dump("do_execute_soon callback\n");
+    complete = true;
+  });
+}