diff -r 000000000000 -r 6474c204b198 services/sync/tests/unit/test_tab_engine.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/services/sync/tests/unit/test_tab_engine.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,36 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+Cu.import("resource://services-sync/engines/tabs.js");
+Cu.import("resource://services-sync/service.js");
+Cu.import("resource://services-sync/util.js");
+
+function getMocks() {
+  let engine = new TabEngine(Service);
+  let store = engine._store;
+  store.getTabState = mockGetTabState;
+  store.shouldSkipWindow = mockShouldSkipWindow;
+  return [engine, store];
+}
+
+function run_test() {
+  _("Test getOpenURLs.");
+  let [engine, store] = getMocks();
+
+  let urls = ["http://bar.com", "http://foo.com", "http://foobar.com"];
+  function threeURLs() {
+    return urls.pop();
+  }
+  store.getWindowEnumerator = mockGetWindowEnumerator.bind(this, threeURLs, 1, 3);
+
+  let matches;
+
+  _("  test matching works (true)");
+  let openurlsset = engine.getOpenURLs();
+  matches = openurlsset.has("http://foo.com");
+  do_check_true(matches);
+
+  _("  test matching works (false)");
+  matches = openurlsset.has("http://barfoo.com");
+  do_check_false(matches);
+}