diff -r 000000000000 -r 6474c204b198 toolkit/components/satchel/test/unit/test_previous_result.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/satchel/test/unit/test_previous_result.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,25 @@
+/* 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 aaaListener = {
+  onSearchResult: function(search, result) {
+    do_check_eq(result.searchString, "aaa");
+    do_test_finished();
+  }
+};
+
+let aaListener = {
+  onSearchResult: function(search, result) {
+    do_check_eq(result.searchString, "aa");
+    search.startSearch("aaa", "", result, aaaListener);
+  }
+};
+
+function run_test()
+{
+  do_test_pending();
+  let search = Cc['@mozilla.org/autocomplete/search;1?name=form-history'].
+               getService(Components.interfaces.nsIAutoCompleteSearch);
+  search.startSearch("aa", "", null, aaListener);
+}