diff -r 000000000000 -r 6474c204b198 toolkit/mozapps/update/tests/unit_aus_update/downloadFileTooBig_gonk.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/mozapps/update/tests/unit_aus_update/downloadFileTooBig_gonk.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,94 @@
+/* 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 KEY_UPDATE_ARCHIVE_DIR = "UpdArchD"
+
+let gActiveUpdate = null;
+
+function FakeDirProvider() {}
+FakeDirProvider.prototype = {
+  classID: Components.ID("{f30b43a7-2bfa-4e5f-8c4f-abc7dd4ac486}"),
+  QueryInterface: XPCOMUtils.generateQI([AUS_Ci.nsIDirectoryServiceProvider]),
+
+  getFile: function(prop, persistent) {
+    if (prop == KEY_UPDATE_ARCHIVE_DIR) {
+      if (gActiveUpdate) {
+        gActiveUpdate.errorCode = AUS_Cr.NS_ERROR_FILE_TOO_BIG;
+      }
+    }
+    return null;
+  }
+};
+
+function run_test() {
+  setupTestCommon();
+
+  setUpdateURLOverride();
+  overrideXHR(xhr_pt1);
+  standardInit();
+
+  logTestInfo("testing that error codes set from a directory provider propagate" +
+              "up to AUS.downloadUpdate() correctly (Bug 794211).");
+
+  gDirProvider = new FakeDirProvider();
+  gOldProvider = AUS_Cc["@mozilla.org/browser/directory-provider;1"]
+                       .createInstance(AUS_Ci.nsIDirectoryServiceProvider);
+
+  gDirService = AUS_Cc["@mozilla.org/file/directory_service;1"]
+                       .getService(AUS_Ci.nsIProperties);
+
+  gDirService.unregisterProvider(gOldProvider);
+  gDirService.registerProvider(gDirProvider);
+
+  Services.prefs.setBoolPref(PREF_APP_UPDATE_SILENT, true);
+  do_execute_soon(run_test_pt1);
+}
+
+function xhr_pt1() {
+  gXHR.status = 200;
+  gXHR.responseText = gResponseBody;
+  try {
+    var parser = AUS_Cc["@mozilla.org/xmlextras/domparser;1"].
+                 createInstance(AUS_Ci.nsIDOMParser);
+    gXHR.responseXML = parser.parseFromString(gResponseBody, "application/xml");
+  } catch (e) {
+    gXHR.responseXML = null;
+  }
+  var e = { target: gXHR };
+  gXHR.onload(e);
+}
+
+function run_test_pt1() {
+  gUpdates = null;
+  gUpdateCount = null;
+  gCheckFunc = check_test_pt1;
+
+
+  let patches = getRemotePatchString();
+  let updates = getRemoteUpdateString(patches);
+  gResponseBody = getRemoteUpdatesXMLString(updates);
+  gUpdateChecker.checkForUpdates(updateCheckListener, true);
+}
+
+function check_test_pt1() {
+  do_check_eq(gUpdateCount, 1);
+
+  gActiveUpdate = gUpdates[0];
+  do_check_neq(gActiveUpdate, null);
+
+  let state = gAUS.downloadUpdate(gActiveUpdate, true);
+  do_check_eq(state, "null");
+  do_check_eq(gActiveUpdate.errorCode >>> 0 , AUS_Cr.NS_ERROR_FILE_TOO_BIG);
+
+  doTestFinish();
+}
+
+function end_test() {
+  gDirService.unregisterProvider(gDirProvider);
+  gDirService.registerProvider(gOldProvider);
+  gActiveUpdate = null;
+  gDirService = null;
+  gDirProvider = null;
+}