diff -r 000000000000 -r 6474c204b198 toolkit/components/downloads/test/unit/test_download_manager.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/downloads/test/unit/test_download_manager.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,135 @@
+/* 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/. */
+
+// This file tests the download manager backend
+
+const nsIDownloadManager = Ci.nsIDownloadManager;
+const dm = Cc["@mozilla.org/download-manager;1"].getService(nsIDownloadManager);
+
+function test_get_download_empty_queue()
+{
+  try {
+    dm.getDownload(0);
+    do_throw("Hey!  We expect to get an excpetion with this!");
+  } catch(e) {
+    do_check_eq(Components.lastResult, Cr.NS_ERROR_NOT_AVAILABLE);
+  }
+}
+
+function test_connection()
+{
+  print("*** DOWNLOAD MANAGER TEST - test_connection");
+  var ds = dm.DBConnection;
+
+  do_check_true(ds.connectionReady);
+
+  do_check_true(ds.tableExists("moz_downloads"));
+}
+
+function test_count_empty_queue()
+{
+  print("*** DOWNLOAD MANAGER TEST - test_count_empty_queue");
+  do_check_eq(0, dm.activeDownloadCount);
+
+  do_check_false(dm.activeDownloads.hasMoreElements());
+}
+
+function test_canCleanUp_empty_queue()
+{
+  print("*** DOWNLOAD MANAGER TEST - test_canCleanUp_empty_queue");
+  do_check_false(dm.canCleanUp);
+}
+
+function test_pauseDownload_empty_queue()
+{
+  print("*** DOWNLOAD MANAGER TEST - test_pauseDownload_empty_queue");
+  try {
+    dm.pauseDownload(0);
+    do_throw("This should not be reached");
+  } catch (e) {
+    do_check_eq(Cr.NS_ERROR_FAILURE, e.result);
+  }
+}
+
+function test_resumeDownload_empty_queue()
+{
+  print("*** DOWNLOAD MANAGER TEST - test_resumeDownload_empty_queue");
+  try {
+    dm.resumeDownload(0);
+    do_throw("This should not be reached");
+  } catch (e) {
+    do_check_eq(Cr.NS_ERROR_FAILURE, e.result);
+  }
+}
+
+function test_addDownload_normal()
+{
+  print("*** DOWNLOAD MANAGER TEST - Testing normal download adding");
+  addDownload(httpserv);
+}
+
+function test_addDownload_cancel()
+{
+  print("*** DOWNLOAD MANAGER TEST - Testing download cancel");
+  var dl = addDownload(httpserv);
+
+  dm.cancelDownload(dl.id);
+
+  do_check_eq(nsIDownloadManager.DOWNLOAD_CANCELED, dl.state);
+}
+
+// This test is actually ran by the observer
+function test_dm_getDownload(aDl)
+{
+  // this will get it from the database
+  var dl = dm.getDownload(aDl.id);
+
+  do_check_eq(aDl.displayName, dl.displayName);
+}
+
+var tests = [test_get_download_empty_queue, test_connection,
+             test_count_empty_queue, test_canCleanUp_empty_queue,
+             test_pauseDownload_empty_queue, test_resumeDownload_empty_queue,
+             test_addDownload_normal, test_addDownload_cancel];
+
+var httpserv = null;
+function run_test()
+{
+  if (oldDownloadManagerDisabled()) {
+    return;
+  }
+
+  httpserv = new HttpServer();
+  httpserv.registerDirectory("/", do_get_cwd());
+  httpserv.start(-1);
+
+  // our download listener
+  var listener = {
+    // this listener checks to ensure activeDownloadCount is correct.
+    onDownloadStateChange: function(aState, aDownload)
+    {
+      do_check_eq(gDownloadCount, dm.activeDownloadCount);
+    },
+    onStateChange: function(a, b, c, d, e) { },
+    onProgressChange: function(a, b, c, d, e, f, g) { },
+    onSecurityChange: function(a, b, c, d) { }
+  };
+  dm.addListener(listener);
+  dm.addListener(getDownloadListener());
+
+  var observer = {
+    observe: function(aSubject, aTopic, aData) {
+      var dl = aSubject.QueryInterface(Ci.nsIDownload);
+      do_check_eq(nsIDownloadManager.DOWNLOAD_CANCELED, dl.state);
+      do_check_true(dm.canCleanUp);
+      test_dm_getDownload(dl);
+    }
+  };
+  var os = Cc["@mozilla.org/observer-service;1"]
+           .getService(Ci.nsIObserverService);
+  os.addObserver(observer, "dl-cancel", false);
+
+  for (var i = 0; i < tests.length; i++)
+    tests[i]();
+}