diff -r 000000000000 -r 6474c204b198 toolkit/devtools/server/tests/unit/test_threadlifetime-04.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/devtools/server/tests/unit/test_threadlifetime-04.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,53 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Check that requesting a thread-lifetime actor twice for the same
+ * value returns the same actor.
+ */
+
+var gDebuggee;
+var gClient;
+var gThreadClient;
+
+function run_test()
+{
+  initTestDebuggerServer();
+  gDebuggee = addTestGlobal("test-grips");
+  gClient = new DebuggerClient(DebuggerServer.connectPipe());
+  gClient.connect(function() {
+    attachTestTabAndResume(gClient, "test-grips", function (aResponse, aTabClient, aThreadClient) {
+      gThreadClient = aThreadClient;
+      test_thread_lifetime();
+    });
+  });
+  do_test_pending();
+}
+
+function test_thread_lifetime()
+{
+  gThreadClient.addOneTimeListener("paused", function (aEvent, aPacket) {
+    let pauseGrip = aPacket.frame.arguments[0];
+
+    gClient.request({ to: pauseGrip.actor, type: "threadGrip" }, function (aResponse) {
+      // Successful promotion won't return an error.
+      do_check_eq(aResponse.error, undefined);
+
+      let threadGrip1 = aResponse.from;
+
+      gClient.request({ to: pauseGrip.actor, type: "threadGrip" }, function (aResponse) {
+        do_check_eq(threadGrip1, aResponse.from);
+        gThreadClient.resume(function() {
+          finishClient(gClient);
+        });
+      });
+    });
+  });
+
+  gDebuggee.eval("(" + function() {
+    function stopMe(arg1) {
+      debugger;
+    };
+    stopMe({obj: true});
+  } + ")()");
+}