diff -r 000000000000 -r 6474c204b198 browser/devtools/framework/test/browser_target_events.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/framework/test/browser_target_events.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,56 @@
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+var target;
+
+function test()
+{
+  waitForExplicitFinish();
+
+  gBrowser.selectedTab = gBrowser.addTab();
+  gBrowser.selectedBrowser.addEventListener("load", onLoad, true);
+}
+
+function onLoad(evt) {
+  gBrowser.selectedBrowser.removeEventListener(evt.type, onLoad, true);
+
+  target = TargetFactory.forTab(gBrowser.selectedTab);
+
+  is(target.tab, gBrowser.selectedTab, "Target linked to the right tab.");
+
+  target.once("hidden", onHidden);
+  gBrowser.selectedTab = gBrowser.addTab();
+}
+
+function onHidden() {
+  ok(true, "Hidden event received");
+  target.once("visible", onVisible);
+  gBrowser.removeCurrentTab();
+}
+
+function onVisible() {
+  ok(true, "Visible event received");
+  target.once("will-navigate", onWillNavigate);
+  gBrowser.contentWindow.location = "data:text/html,test navigation";
+}
+
+function onWillNavigate(event, request) {
+  ok(true, "will-navigate event received");
+  // Wait for navigation handling to complete before removing the tab, in order
+  // to avoid triggering assertions.
+  target.once("navigate", executeSoon.bind(null, onNavigate));
+}
+
+function onNavigate() {
+  ok(true, "navigate event received");
+  target.once("close", onClose);
+  gBrowser.removeCurrentTab();
+}
+
+function onClose() {
+  ok(true, "close event received");
+
+  target = null;
+  finish();
+}