diff -r 000000000000 -r 6474c204b198 toolkit/mozapps/update/tests/unit_aus_update/downloadCompleteAfterPartialFailure.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/mozapps/update/tests/unit_aus_update/downloadCompleteAfterPartialFailure.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,80 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function run_test() {
+  setupTestCommon();
+
+  logTestInfo("testing download a complete on partial failure. Calling " +
+              "nsIUpdatePrompt::showUpdateError should call getNewPrompter " +
+              "and alert on the object returned by getNewPrompter when the " +
+              "update.state == " + STATE_FAILED + " and the update.errorCode " +
+              "== " + WRITE_ERROR + " (Bug 595059).");
+
+  Services.prefs.setBoolPref(PREF_APP_UPDATE_SILENT, false);
+
+  let registrar = Components.manager.QueryInterface(AUS_Ci.nsIComponentRegistrar);
+  registrar.registerFactory(Components.ID("{1dfeb90a-2193-45d5-9cb8-864928b2af55}"),
+                            "Fake Window Watcher",
+                            "@mozilla.org/embedcomp/window-watcher;1",
+                            WindowWatcherFactory);
+
+  standardInit();
+
+  writeUpdatesToXMLFile(getLocalUpdatesXMLString(""), false);
+  let url = URL_HOST + "/" + FILE_COMPLETE_MAR;
+  let patches = getLocalPatchString("complete", url, null, null, null, null,
+                                    STATE_FAILED);
+  let updates = getLocalUpdateString(patches, null, null, "version 1.0", "1.0",
+                                     null, null, null, null, url);
+  writeUpdatesToXMLFile(getLocalUpdatesXMLString(updates), true);
+  writeStatusFile(STATE_FAILED);
+
+  reloadUpdateManagerData();
+
+  let update = gUpdateManager.activeUpdate;
+  update.errorCode = WRITE_ERROR;
+  let prompter = AUS_Cc["@mozilla.org/updates/update-prompt;1"].
+                 createInstance(AUS_Ci.nsIUpdatePrompt);
+  prompter.showUpdateError(update);
+}
+
+function end_test() {
+  let registrar = Components.manager.QueryInterface(AUS_Ci.nsIComponentRegistrar);
+  registrar.unregisterFactory(Components.ID("{1dfeb90a-2193-45d5-9cb8-864928b2af55}"),
+                              WindowWatcherFactory);
+}
+
+var WindowWatcher = {
+  getNewPrompter: function(aParent) {
+    do_check_eq(aParent, null);
+    return {
+      alert: function(aTitle, aText) {
+        let title = getString("updaterIOErrorTitle");
+        do_check_eq(aTitle, title);
+        let text = gUpdateBundle.formatStringFromName("updaterIOErrorMsg",
+                                                      [Services.appinfo.name,
+                                                       Services.appinfo.name], 2);
+        do_check_eq(aText, text);
+
+        doTestFinish();
+      }
+    }; 
+  },
+
+  QueryInterface: function(iid) {
+    if (iid.equals(AUS_Ci.nsIWindowWatcher) ||
+        iid.equals(AUS_Ci.nsISupports))
+      return this;
+
+    throw AUS_Cr.NS_ERROR_NO_INTERFACE;
+  }
+}
+
+var WindowWatcherFactory = {
+  createInstance: function createInstance(outer, iid) {
+    if (outer != null)
+      throw AUS_Cr.NS_ERROR_NO_AGGREGATION;
+    return WindowWatcher.QueryInterface(iid);
+  }
+};