diff -r 000000000000 -r 6474c204b198 toolkit/mozapps/update/tests/unit_aus_update/downloadInterruptedByOfflineRetry.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/mozapps/update/tests/unit_aus_update/downloadInterruptedByOfflineRetry.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,78 @@
+/* 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/.
+ */
+
+// Needs to be in sync w/ nsUpdateService.js
+const NETWORK_ERROR_OFFLINE = 111;
+
+function run_test() {
+  setupTestCommon();
+
+  logTestInfo("testing when an update check fails because the network is " +
+              "offline that we check again when the network comes online " +
+              "(Bug 794211).");
+
+  setUpdateURLOverride();
+  Services.prefs.setBoolPref(PREF_APP_UPDATE_AUTO, false);
+
+  overrideXHR(null);
+  overrideUpdatePrompt(updatePrompt);
+  standardInit();
+
+  do_execute_soon(run_test_pt1);
+}
+
+function run_test_pt1() {
+  gResponseBody = null;
+  gCheckFunc = check_test_pt1;
+  gXHRCallback = xhr_pt1;
+  gUpdateChecker.checkForUpdates(updateCheckListener, true);
+}
+
+function xhr_pt1() {
+  gXHR.status = AUS_Cr.NS_ERROR_OFFLINE;
+  gXHR.onerror({ target: gXHR });
+}
+
+function check_test_pt1(request, update) {
+  do_check_eq(gStatusCode, AUS_Cr.NS_ERROR_OFFLINE);
+  do_check_eq(update.errorCode, NETWORK_ERROR_OFFLINE);
+
+  // Forward the error to AUS, which should register the online observer
+  gAUS.onError(request, update);
+
+  // Trigger another check by notifying the offline status observer
+  gXHRCallback = xhr_pt2;
+  Services.obs.notifyObservers(gAUS, "network:offline-status-changed", "online");
+}
+
+var updatePrompt = {
+  showUpdateAvailable: function(update) {
+    check_test_pt2(update);
+  }
+};
+
+function xhr_pt2() {
+  var patches = getLocalPatchString();
+  var updates = getLocalUpdateString(patches);
+  var responseBody = getLocalUpdatesXMLString(updates);
+
+  gXHR.status = 200;
+  gXHR.responseText = responseBody;
+  try {
+    var parser = AUS_Cc["@mozilla.org/xmlextras/domparser;1"].
+                 createInstance(AUS_Ci.nsIDOMParser);
+    gXHR.responseXML = parser.parseFromString(responseBody, "application/xml");
+  } catch (e) {
+  }
+  gXHR.onload({ target: gXHR });
+}
+
+function check_test_pt2(update) {
+  // We just verify that there are updates to know the check succeeded.
+  do_check_neq(update, null);
+  do_check_eq(update.name, "App Update Test");
+
+  doTestFinish();
+}