diff -r 000000000000 -r 6474c204b198 image/test/unit/test_async_notification_404.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/image/test/unit/test_async_notification_404.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+/*
+ * Test to ensure that load/decode notifications are delivered completely and
+ * asynchronously when dealing with a file that's a 404.
+ */
+Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
+
+var ioService = Components.classes["@mozilla.org/network/io-service;1"]
+                           .getService(Components.interfaces.nsIIOService);
+
+XPCOMUtils.defineLazyGetter(this, "uri", function() {
+    return ioService.newURI("http://localhost:" +
+                            server.identity.primaryPort +
+                            "/async-notification-never-here.jpg", null, null);
+});
+
+load('async_load_tests.js');