diff -r 000000000000 -r 6474c204b198 webapprt/content/mochitest.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/webapprt/content/mochitest.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,35 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/Services.jsm");
+
+Services.scriptloader
+        .loadSubScript("chrome://webapprt/content/mochitest-shared.js", this);
+
+// In test mode, the runtime isn't configured until we tell it to become
+// an app, which requires us to use DOMApplicationRegistry to install one.
+// But DOMApplicationRegistry needs to know the location of its registry dir,
+// so we need to configure the runtime with at least that information.
+WebappRT.config = {
+  registryDir: Services.dirsvc.get("ProfD", Ci.nsIFile).path,
+};
+
+Cu.import("resource://gre/modules/Webapps.jsm");
+
+becomeWebapp("http://mochi.test:8888/tests/webapprt/test/content/test.webapp",
+             undefined, function onBecome() {
+  if (window.arguments && window.arguments[0]) {
+    let testUrl = window.arguments[0].QueryInterface(Ci.nsIPropertyBag2).get("url");
+
+    if (testUrl) {
+      let win = Services.wm.getMostRecentWindow("webapprt:webapp");
+      win.document.getElementById("content").setAttribute("src", testUrl);
+    }
+  }
+
+  window.close();
+});