diff -r 000000000000 -r 6474c204b198 toolkit/devtools/server/tests/unit/test_register_actor.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/devtools/server/tests/unit/test_register_actor.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const Profiler = Cc["@mozilla.org/tools/profiler;1"].getService(Ci.nsIProfiler);
+
+function check_actors(expect) {
+  do_check_eq(expect, DebuggerServer.tabActorFactories.hasOwnProperty("registeredActor1"));
+  do_check_eq(expect, DebuggerServer.tabActorFactories.hasOwnProperty("registeredActor2"));
+
+  do_check_eq(expect, DebuggerServer.globalActorFactories.hasOwnProperty("registeredActor2"));
+  do_check_eq(expect, DebuggerServer.globalActorFactories.hasOwnProperty("registeredActor1"));
+}
+
+function run_test()
+{
+  DebuggerServer.init(function () { return true; });
+  // The xpcshell-test/ path maps to resource://test/
+  DebuggerServer.registerModule("xpcshell-test/registertestactors-01");
+  DebuggerServer.registerModule("xpcshell-test/registertestactors-02");
+
+  check_actors(true);
+
+  check_except(() => {
+    DebuggerServer.registerModule("xpcshell-test/registertestactors-01");
+  });
+  check_except(() => {
+    DebuggerServer.registerModule("xpcshell-test/registertestactors-02");
+  });
+
+  DebuggerServer.unregisterModule("xpcshell-test/registertestactors-01");
+  DebuggerServer.unregisterModule("xpcshell-test/registertestactors-02");
+  check_actors(false);
+
+  DebuggerServer.registerModule("xpcshell-test/registertestactors-01");
+  DebuggerServer.registerModule("xpcshell-test/registertestactors-02");
+  check_actors(true);
+
+  DebuggerServer.destroy();
+  check_actors(false);
+}
+