diff -r 000000000000 -r 6474c204b198 browser/devtools/debugger/test/browser_dbg_navigation.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/debugger/test/browser_dbg_navigation.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,73 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Check tab attach/navigation.
+ */
+
+const TAB1_URL = EXAMPLE_URL + "doc_empty-tab-01.html";
+const TAB2_URL = EXAMPLE_URL + "doc_empty-tab-02.html";
+
+let gClient;
+
+function test() {
+  if (!DebuggerServer.initialized) {
+    DebuggerServer.init(() => true);
+    DebuggerServer.addBrowserActors();
+  }
+
+  let transport = DebuggerServer.connectPipe();
+  gClient = new DebuggerClient(transport);
+  gClient.connect((aType, aTraits) => {
+    is(aType, "browser",
+      "Root actor should identify itself as a browser.");
+
+    addTab(TAB1_URL)
+      .then(() => attachTabActorForUrl(gClient, TAB1_URL))
+      .then(testNavigate)
+      .then(testDetach)
+      .then(finish)
+      .then(null, aError => {
+        ok(false, "Got an error: " + aError.message + "\n" + aError.stack);
+      });
+  });
+}
+
+function testNavigate([aGrip, aResponse]) {
+  let outstanding = [promise.defer(), promise.defer()];
+
+  gClient.addListener("tabNavigated", function onTabNavigated(aEvent, aPacket) {
+    is(aPacket.url, TAB2_URL,
+      "Got a tab navigation notification.");
+
+    if (aPacket.state == "start") {
+      ok(true, "Tab started to navigate.");
+      outstanding[0].resolve();
+    } else {
+      ok(true, "Tab finished navigating.");
+      gClient.removeListener("tabNavigated", onTabNavigated);
+      outstanding[1].resolve();
+    }
+  });
+
+  gBrowser.selectedTab.linkedBrowser.loadURI(TAB2_URL);
+  return promise.all(outstanding.map(e => e.promise))
+                .then(() => aGrip.actor);
+}
+
+function testDetach(aActor) {
+  let deferred = promise.defer();
+
+  gClient.addOneTimeListener("tabDetached", (aType, aPacket) => {
+    ok(true, "Got a tab detach notification.");
+    is(aPacket.from, aActor, "tab detach message comes from the expected actor");
+    gClient.close(deferred.resolve);
+  });
+
+  removeTab(gBrowser.selectedTab);
+  return deferred.promise;
+}
+
+registerCleanupFunction(function() {
+  gClient = null;
+});