diff -r 000000000000 -r 6474c204b198 browser/components/dirprovider/tests/unit/head_dirprovider.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/dirprovider/tests/unit/head_dirprovider.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+/* 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;
+
+var gProfD = do_get_profile();
+var gDirSvc = Cc["@mozilla.org/file/directory_service;1"].
+              getService(Ci.nsIProperties);
+var gPrefSvc = Cc["@mozilla.org/preferences-service;1"].
+               getService(Ci.nsIPrefBranch);
+
+function writeTestFile(aParent, aName) {
+  let file = aParent.clone();
+  file.append(aName);
+  file.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0644);
+  return file;
+}
+