diff -r 000000000000 -r 6474c204b198 browser/devtools/debugger/test/browser_dbg_listtabs-03.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/debugger/test/browser_dbg_listtabs-03.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,80 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Make sure the listTabs request works as specified.
+ */
+
+const TAB1_URL = EXAMPLE_URL + "doc_empty-tab-01.html";
+
+let gTab1, gTab1Actor, gTab2, gTab2Actor, gClient;
+
+function listTabs() {
+  let deferred = promise.defer();
+
+  gClient.listTabs(aResponse => {
+    deferred.resolve(aResponse.tabs);
+  });
+
+  return deferred.promise;
+}
+
+function request(params) {
+  let deferred = promise.defer();
+  gClient.request(params, deferred.resolve);
+  return deferred.promise;
+}
+
+function test() {
+  if (!DebuggerServer.initialized) {
+    DebuggerServer.init(() => true);
+    DebuggerServer.addBrowserActors();
+  }
+
+  let transport = DebuggerServer.connectPipe();
+  gClient = new DebuggerClient(transport);
+  gClient.connect(Task.async(function*(aType, aTraits) {
+    is(aType, "browser",
+      "Root actor should identify itself as a browser.");
+    let tab = yield addTab(TAB1_URL);
+
+    let tabs = yield listTabs();
+    is(tabs.length, 2, "Should be two tabs");
+    let tabGrip = tabs.filter(a => a.url ==TAB1_URL).pop();
+    ok(tabGrip, "Should have an actor for the tab");
+
+    let response = yield request({ to: tabGrip.actor, type: "attach" });
+    is(response.type, "tabAttached", "Should have attached");
+
+    tabs = yield listTabs();
+
+    response = yield request({ to: tabGrip.actor, type: "detach" });
+    is(response.type, "detached", "Should have detached");
+
+    let newGrip = tabs.filter(a => a.url ==TAB1_URL).pop();
+    is(newGrip.actor, tabGrip.actor, "Should have the same actor for the same tab");
+
+    response = yield request({ to: tabGrip.actor, type: "attach" });
+    is(response.type, "tabAttached", "Should have attached");
+    response = yield request({ to: tabGrip.actor, type: "detach" });
+    is(response.type, "detached", "Should have detached");
+
+    yield removeTab(tab);
+    yield closeConnection();
+    finish();
+  }));
+}
+
+function closeConnection() {
+  let deferred = promise.defer();
+  gClient.close(deferred.resolve);
+  return deferred.promise;
+}
+
+registerCleanupFunction(function() {
+  gTab1 = null;
+  gTab1Actor = null;
+  gTab2 = null;
+  gTab2Actor = null;
+  gClient = null;
+});