diff -r 000000000000 -r 6474c204b198 browser/devtools/inspector/test/browser_inspector_basic_highlighter.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/inspector/test/browser_inspector_basic_highlighter.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,62 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+function test() {
+  let inspector, doc, toolbox;
+  let {devtools} = Cu.import("resource://gre/modules/devtools/Loader.jsm", {});
+  let {require} = devtools;
+  let {Promise: promise} = Cu.import("resource://gre/modules/Promise.jsm", {});
+  let {Task} = Cu.import("resource://gre/modules/Task.jsm", {});
+
+  waitForExplicitFinish();
+
+  gBrowser.selectedTab = gBrowser.addTab();
+  gBrowser.selectedBrowser.addEventListener("load", function onload() {
+    gBrowser.selectedBrowser.removeEventListener("load", onload, true);
+    doc = content.document;
+    waitForFocus(setupTest, content);
+  }, true);
+
+  content.location = "data:text/html;charset=utf-8,<h1>foo</h1><span>bar</span>";
+
+  function setupTest() {
+    openInspector((aInspector, aToolbox) => {
+      toolbox = aToolbox;
+      inspector = aInspector;
+      inspector.selection.setNode(doc.querySelector("span"), "test");
+      inspector.toolbox.once("highlighter-ready", runTests);
+    });
+  }
+
+  function runTests() {
+    Task.spawn(function() {
+      yield hoverH1InMarkupView();
+      yield assertH1Highlighted();
+
+      finishUp();
+    }).then(null, Cu.reportError);
+  }
+
+  function hoverH1InMarkupView() {
+    let deferred = promise.defer();
+    let container = getContainerForRawNode(inspector.markup, doc.querySelector("h1"));
+
+    inspector.toolbox.once("highlighter-ready", deferred.resolve);
+    EventUtils.synthesizeMouseAtCenter(container.tagLine, {type: "mousemove"},
+                                       inspector.markup.doc.defaultView);
+
+    return deferred.promise;
+  }
+
+  function assertH1Highlighted() {
+    ok(isHighlighting(), "The highlighter is shown on a markup container hover");
+    is(getHighlitNode(), doc.querySelector("h1"), "The highlighter highlights the right node");
+  }
+
+  function finishUp() {
+    inspector = doc = toolbox = null;
+    gBrowser.removeCurrentTab();
+    finish();
+  }
+}