diff -r 000000000000 -r 6474c204b198 browser/devtools/tilt/test/browser_tilt_04_initialization.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/tilt/test/browser_tilt_04_initialization.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,57 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+function test() {
+  if (!isTiltEnabled()) {
+    info("Skipping initialization test because Tilt isn't enabled.");
+    return;
+  }
+  if (!isWebGLSupported()) {
+    info("Skipping initialization test because WebGL isn't supported.");
+    return;
+  }
+
+  waitForExplicitFinish();
+
+  createTab(function() {
+    let id = TiltUtils.getWindowId(gBrowser.selectedBrowser.contentWindow);
+
+    is(id, Tilt.currentWindowId,
+      "The unique window identifiers should match for the same window.");
+
+    createTilt({
+      onTiltOpen: function(instance)
+      {
+        is(document.activeElement, instance.presenter.canvas,
+          "The visualizer canvas should be focused on initialization.");
+
+        ok(Tilt.visualizers[id] instanceof TiltVisualizer,
+          "A new instance of the visualizer wasn't created properly.");
+        ok(Tilt.visualizers[id].isInitialized(),
+          "The new instance of the visualizer wasn't initialized properly.");
+      },
+      onTiltClose: function()
+      {
+        is(document.activeElement, gBrowser.selectedBrowser,
+          "The focus wasn't correctly given back to the selectedBrowser.");
+
+        is(Tilt.visualizers[id], null,
+          "The current instance of the visualizer wasn't destroyed properly.");
+      },
+      onEnd: function()
+      {
+        cleanup();
+      }
+    }, true, function suddenDeath()
+    {
+      info("Tilt could not be initialized properly.");
+      cleanup();
+    });
+  });
+}
+
+function cleanup() {
+  gBrowser.removeCurrentTab();
+  finish();
+}