diff -r 000000000000 -r 6474c204b198 toolkit/components/downloads/test/unit/test_bug_382825.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/downloads/test/unit/test_bug_382825.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,54 @@
+/* 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 tests the retryDownload function of nsIDownloadManager.  This function
+// was added in Bug 382825.
+
+const nsIDownloadManager = Ci.nsIDownloadManager;
+const dm = Cc["@mozilla.org/download-manager;1"].getService(nsIDownloadManager);
+
+function test_retry_canceled()
+{
+  var dl = addDownload(httpserv);
+
+  // since we are going to be retrying a failed download, we need to inflate
+  // this so it doesn't stop our server
+  gDownloadCount++;
+
+  dm.cancelDownload(dl.id);
+
+  do_check_eq(nsIDownloadManager.DOWNLOAD_CANCELED, dl.state);
+
+  // Our download object will no longer be updated.
+  dm.retryDownload(dl.id);
+}
+
+function test_retry_bad()
+{
+  try {
+    dm.retryDownload(0);
+    do_throw("Hey!  We expect to get an exception with this!");
+  } catch(e) {
+    do_check_eq(Components.lastResult, Cr.NS_ERROR_NOT_AVAILABLE);
+  }
+}
+
+var tests = [test_retry_canceled, test_retry_bad];
+
+var httpserv = null;
+function run_test()
+{
+  if (oldDownloadManagerDisabled()) {
+    return;
+  }
+
+  httpserv = new HttpServer();
+  httpserv.registerDirectory("/", do_get_cwd());
+  httpserv.start(-1);
+
+  dm.addListener(getDownloadListener());
+
+  for (var i = 0; i < tests.length; i++)
+    tests[i]();
+}