diff -r 000000000000 -r 6474c204b198 toolkit/components/osfile/tests/xpcshell/test_osfile_async.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/osfile/tests/xpcshell/test_osfile_async.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+"use strict";
+
+Components.utils.import("resource://gre/modules/osfile.jsm");
+
+/**
+ * A trivial test ensuring that we can call osfile from xpcshell.
+ * (see bug 808161)
+ */
+
+function run_test() {
+  do_test_pending();
+  OS.File.getCurrentDirectory().then(
+    do_test_finished,
+    do_test_finished
+  );
+}