diff -r 000000000000 -r 6474c204b198 browser/components/migration/tests/unit/head_migration.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/migration/tests/unit/head_migration.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,64 @@
+/* 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 Cc = Components.classes;
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+const Cr = Components.results;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils",
+                                  "resource://gre/modules/PlacesUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "FileUtils",
+                                  "resource://gre/modules/FileUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "MigrationUtils",
+                                  "resource:///modules/MigrationUtils.jsm");
+// Initialize profile.
+let gProfD = do_get_profile();
+
+// Create a fake XULAppInfo to satisfy the eventual needs of the migrators.
+let (XULAppInfo = {
+  // nsIXUlAppInfo
+  get vendor() "Mozilla",
+  get name() "XPCShell",
+  get ID() "xpcshell@tests.mozilla.org",
+  get version() "1",
+  get appBuildID() "2007010101",
+  get platformVersion() "1.0",
+  get platformBuildID() "2007010101",
+
+  // nsIXUlRuntime (partial)
+  get inSafeMode() false,
+  logConsoleErrors: true,
+  get OS() "XPCShell",
+  get XPCOMABI() "noarch-spidermonkey",
+  invalidateCachesOnRestart: function () {},
+
+  // nsIWinAppHelper
+  get userCanElevate() false,
+
+  QueryInterface: function (aIID) {
+    let interfaces = [Ci.nsIXULAppInfo, Ci.nsIXULRuntime];
+    if ("nsIWinAppHelper" in Ci)
+      interfaces.push(Ci.nsIWinAppHelper);
+    if (!interfaces.some(function (v) aIID.equals(v)))
+      throw Cr.NS_ERROR_NO_INTERFACE;
+    return this;
+  }
+}) {
+  const CONTRACT_ID = "@mozilla.org/xre/app-info;1";
+  const CID = Components.ID("7685dac8-3637-4660-a544-928c5ec0e714}");
+
+  let registrar = Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
+  registrar.registerFactory(CID, "XULAppInfo", CONTRACT_ID, {
+    createInstance: function (aOuter, aIID) {
+      if (aOuter != null)
+        throw Cr.NS_ERROR_NO_AGGREGATION;
+      return XULAppInfo.QueryInterface(aIID);
+    },
+    QueryInterface: XPCOMUtils.generateQI(Ci.nsIFactory)
+  });
+}