diff -r 000000000000 -r 6474c204b198 toolkit/components/places/tests/unit/test_420331_wyciwyg.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/places/tests/unit/test_420331_wyciwyg.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et: */
+/* 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/. */
+
+function run_test()
+{
+  run_next_test();
+}
+
+add_task(function test_execute()
+{
+  var testURI = uri("wyciwyg://nodontjudgeabookbyitscover");
+
+  try
+  {
+    yield promiseAddVisits(testURI);
+    do_throw("Should have generated an exception.");
+  } catch (ex if ex && ex.result == Cr.NS_ERROR_ILLEGAL_VALUE) {
+    // Adding wyciwyg URIs should raise NS_ERROR_ILLEGAL_VALUE.
+  }
+});