diff -r 000000000000 -r 6474c204b198 services/sync/tests/unit/test_service_startup.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/services/sync/tests/unit/test_service_startup.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,54 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+Cu.import("resource://services-common/observers.js");
+Cu.import("resource://services-sync/engines.js");
+Cu.import("resource://services-sync/util.js");
+Cu.import("resource://testing-common/services/sync/utils.js");
+
+Svc.Prefs.set("registerEngines", "Tab,Bookmarks,Form,History");
+Cu.import("resource://services-sync/service.js");
+
+function run_test() {
+  _("When imported, Service.onStartup is called");
+  initTestLogging("Trace");
+
+  let xps = Cc["@mozilla.org/weave/service;1"]
+              .getService(Ci.nsISupports)
+              .wrappedJSObject;
+  do_check_false(xps.enabled);
+
+  // Test fixtures
+  Service.identity.username = "johndoe";
+  do_check_false(xps.enabled);
+
+  Cu.import("resource://services-sync/service.js");
+
+  _("Service is enabled.");
+  do_check_eq(Service.enabled, true);
+
+  _("Engines are registered.");
+  let engines = Service.engineManager.getAll();
+  do_check_true(Utils.deepEquals([engine.name for each (engine in engines)],
+                                 ['tabs', 'bookmarks', 'forms', 'history']));
+
+  _("Observers are notified of startup");
+  do_test_pending();
+
+  do_check_false(Service.status.ready);
+  do_check_false(xps.ready);
+  Observers.add("weave:service:ready", function (subject, data) {
+    do_check_true(Service.status.ready);
+    do_check_true(xps.ready);
+
+    // Clean up.
+    Svc.Prefs.resetBranch("");
+    do_test_finished();
+  });
+
+  do_check_false(xps.enabled);
+
+  Service.identity.account = "johndoe";
+  Service.clusterURL = "http://localhost/";
+  do_check_true(xps.enabled);
+}