diff -r 000000000000 -r 6474c204b198 toolkit/components/downloads/test/browser/browser_nsIDownloadManagerUI.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/downloads/test/browser/browser_nsIDownloadManagerUI.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,106 @@
+/* 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/. */
+let Cr = Components.results;
+
+function test_visibility_open()
+{
+  var dmui = Cc["@mozilla.org/download-manager-ui;1"].
+             getService(Ci.nsIDownloadManagerUI);
+  is(dmui.visible, true,
+     "nsIDownloadManagerUI indicates that the UI is visible");
+}
+
+function test_getAttention_opened()
+{
+  var dmui = Cc["@mozilla.org/download-manager-ui;1"].
+             getService(Ci.nsIDownloadManagerUI);
+
+  // switch focus to this window
+  window.focus();
+
+  dmui.getAttention();
+  is(dmui.visible, true,
+     "nsIDownloadManagerUI indicates that the UI is visible");
+}
+
+function test_visibility_closed(aWin)
+{
+  var dmui = Cc["@mozilla.org/download-manager-ui;1"].
+             getService(Ci.nsIDownloadManagerUI);
+  aWin.close();
+  is(dmui.visible, false,
+     "nsIDownloadManagerUI indicates that the UI is not visible");
+}
+
+function test_getAttention_closed()
+{
+  var dmui = Cc["@mozilla.org/download-manager-ui;1"].
+             getService(Ci.nsIDownloadManagerUI);
+
+  var exceptionCaught = false;
+  try {
+    dmui.getAttention();
+  } catch (e) {
+    is(e.result, Cr.NS_ERROR_UNEXPECTED,
+       "Proper exception was caught");
+    exceptionCaught = true;
+  } finally {
+    is(exceptionCaught, true,
+       "Exception was caught, as expected");
+  }
+}
+
+var testFuncs = [
+    test_visibility_open
+  , test_getAttention_opened
+  , test_visibility_closed /* all tests after this *must* expect there to be
+                              no open window, otherwise they will fail! */
+  , test_getAttention_closed
+];
+
+function test()
+{
+  try {
+    if (Services.prefs.getBoolPref("browser.download.useJSTransfer")) {
+      return;
+    }
+  } catch (ex) { }
+
+  var dm = Cc["@mozilla.org/download-manager;1"].
+           getService(Ci.nsIDownloadManager);
+  var db = dm.DBConnection;
+
+  // First, we populate the database with some fake data
+  db.executeSimpleSQL("DELETE FROM moz_downloads");
+
+  // See if the DM is already open, and if it is, close it!
+  var win = Services.wm.getMostRecentWindow("Download:Manager");
+  if (win)
+    win.close();
+
+  // Ensure that the download manager callbacks and nsIDownloadManagerUI always
+  // use the window UI instead of the panel in the browser's window.
+  Services.prefs.setBoolPref("browser.download.useToolkitUI", true);
+  registerCleanupFunction(function() {
+    Services.prefs.clearUserPref("browser.download.useToolkitUI");
+  });
+
+  // OK, now that all the data is in, let's pull up the UI
+  Cc["@mozilla.org/download-manager-ui;1"].
+  getService(Ci.nsIDownloadManagerUI).show();
+
+  // The window doesn't open once we call show, so we need to wait a little bit
+  function finishUp() {
+    var win = Services.wm.getMostRecentWindow("Download:Manager");
+
+    // Now we can run our tests
+    for each (var t in testFuncs)
+      t(win);
+
+    finish();
+  }
+  
+  waitForExplicitFinish();
+  window.setTimeout(finishUp, 1000);
+}