diff -r 000000000000 -r 6474c204b198 browser/devtools/layoutview/test/head.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/layoutview/test/head.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,87 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+Cu.import("resource://gre/modules/Task.jsm");
+
+let {devtools} = Cu.import("resource://gre/modules/devtools/Loader.jsm", {});
+const {Promise: promise} = Cu.import("resource://gre/modules/Promise.jsm", {});
+let TargetFactory = devtools.TargetFactory;
+
+Services.prefs.setBoolPref("devtools.inspector.sidebarOpen", true);
+Services.prefs.setIntPref("devtools.toolbox.footer.height", 350);
+gDevTools.testing = true;
+SimpleTest.registerCleanupFunction(() => {
+  Services.prefs.clearUserPref("devtools.inspector.sidebarOpen");
+  Services.prefs.clearUserPref("devtools.toolbox.footer.height");
+  gDevTools.testing = false;
+});
+
+// All tests are async in general
+waitForExplicitFinish();
+
+function loadTab(url) {
+  let deferred = promise.defer();
+
+  gBrowser.selectedTab = gBrowser.addTab();
+  gBrowser.selectedBrowser.addEventListener("load", function onload() {
+    gBrowser.selectedBrowser.removeEventListener("load", onload, true);
+    waitForFocus(function() {
+      deferred.resolve(content);
+    }, content);
+  }, true);
+
+  content.location = url;
+
+  return deferred.promise;
+}
+
+function selectNode(aNode) {
+  info("selecting node");
+  let onSelect = inspector.once("layoutview-updated");
+  inspector.selection.setNode(aNode, "test");
+  return onSelect.then(() => {
+    let view = inspector.sidebar.getWindowForTab("layoutview");
+    ok(!!view.layoutview, "LayoutView document is alive.");
+
+    return view;
+  });
+}
+
+function waitForUpdate() {
+  return inspector.once("layoutview-updated");
+}
+
+function asyncTest(testfunc) {
+  return Task.async(function*() {
+    let initialTab = gBrowser.selectedTab;
+
+    yield testfunc();
+
+    // Remove all tabs except for the initial tab. This is basically
+    // gBrowser.removeAllTabsBut without the animation
+    let tabs = gBrowser.visibleTabs;
+    gBrowser.selectedTab = initialTab;
+    for (let i = tabs.length - 1; i >= 0; i--) {
+      if (tabs[i] != initialTab)
+        gBrowser.removeTab(tabs[i]);
+    }
+
+    // Reset the sidebar back to the default
+    Services.prefs.setCharPref("devtools.inspector.activeSidebar", "ruleview");
+
+    finish();
+  });
+}
+
+var TESTS = [];
+
+function addTest(message, func) {
+  TESTS.push([message, Task.async(func)])
+}
+
+var runTests = Task.async(function*() {
+  for (let [message, test] of TESTS) {
+    info(message);
+    yield test();
+  }
+});