diff -r 000000000000 -r 6474c204b198 toolkit/content/tests/unit/test_updateChannelModule.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/content/tests/unit/test_updateChannelModule.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,36 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+Components.utils.import("resource://gre/modules/Preferences.jsm");
+Components.utils.import("resource://gre/modules/UpdateChannel.jsm");
+
+const PREF_APP_UPDATE_CHANNEL = "app.update.channel";
+const TEST_CHANNEL            = "TestChannel";
+const PREF_PARTNER_A          = "app.partner.test_partner_a";
+const TEST_PARTNER_A          = "TestPartnerA";
+const PREF_PARTNER_B          = "app.partner.test_partner_b";
+const TEST_PARTNER_B          = "TestPartnerB";
+
+function test_get() {
+  let defaultPrefs = new Preferences({ defaultBranch: true });
+  let currentChannel = defaultPrefs.get(PREF_APP_UPDATE_CHANNEL);
+
+  do_check_eq(UpdateChannel.get(), currentChannel);
+  do_check_eq(UpdateChannel.get(false), currentChannel);
+
+  defaultPrefs.set(PREF_APP_UPDATE_CHANNEL, TEST_CHANNEL);
+  do_check_eq(UpdateChannel.get(), TEST_CHANNEL);
+  do_check_eq(UpdateChannel.get(false), TEST_CHANNEL);
+
+  defaultPrefs.set(PREF_PARTNER_A, TEST_PARTNER_A);
+  defaultPrefs.set(PREF_PARTNER_B, TEST_PARTNER_B);
+  do_check_eq(UpdateChannel.get(),
+              TEST_CHANNEL + "-cck-" + TEST_PARTNER_A + "-" + TEST_PARTNER_B);
+  do_check_eq(UpdateChannel.get(false), TEST_CHANNEL);
+}
+
+function run_test() {
+  test_get();
+}