diff -r 000000000000 -r 6474c204b198 browser/devtools/inspector/test/browser_inspector_tree_height.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/inspector/test/browser_inspector_tree_height.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,111 @@
+/* -*- Mode: Javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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/. */
+let doc;
+let salutation;
+let closing;
+
+const NEWHEIGHT = 226;
+
+function createDocument()
+{
+  doc.body.innerHTML = '<div id="first" style="{ margin: 10em; ' +
+    'font-size: 14pt; font-family: helvetica, sans-serif; color: #AAA}">\n' +
+    '<h1>Some header text</h1>\n' +
+    '<p id="salutation" style="{font-size: 12pt}">hi.</p>\n' +
+    '<p id="body" style="{font-size: 12pt}">I am a test-case. This text exists ' +
+    'solely to provide some things to test the inspector initialization.</p>\n' +
+    'If you are reading this, you should go do something else instead. Maybe ' +
+    'read a book. Or better yet, write some test-cases for another bit of code. ' +
+    '<span style="{font-style: italic}">Maybe more inspector test-cases!</span></p>\n' +
+    '<p id="closing">end transmission</p>\n' +
+    '</div>';
+  doc.title = "Inspector Initialization Test";
+  startInspectorTests();
+}
+
+function startInspectorTests()
+{
+  ok(InspectorUI, "InspectorUI variable exists");
+  Services.obs.addObserver(runInspectorTests,
+    InspectorUI.INSPECTOR_NOTIFICATIONS.OPENED, false);
+  InspectorUI.toggleInspectorUI();
+}
+
+function runInspectorTests()
+{
+  Services.obs.removeObserver(runInspectorTests,
+    InspectorUI.INSPECTOR_NOTIFICATIONS.OPENED);
+
+  if (InspectorUI.treePanelEnabled) {
+    Services.obs.addObserver(treePanelTests,
+      InspectorUI.INSPECTOR_NOTIFICATIONS.TREEPANELREADY, false);
+
+    InspectorUI.stopInspecting();
+
+    InspectorUI.treePanel.open();
+  } else
+    finishInspectorTests();
+}
+
+function treePanelTests()
+{
+  Services.obs.removeObserver(treePanelTests,
+    InspectorUI.INSPECTOR_NOTIFICATIONS.TREEPANELREADY);
+  Services.obs.addObserver(treePanelTests2,
+    InspectorUI.INSPECTOR_NOTIFICATIONS.TREEPANELREADY, false);
+
+  ok(InspectorUI.treePanel.isOpen(), "Inspector Tree Panel is open");
+
+  let height = Services.prefs.getIntPref("devtools.inspector.htmlHeight");
+
+  is(InspectorUI.treePanel.container.height, height,
+     "Container height is " + height);
+
+  InspectorUI.treePanel.container.height = NEWHEIGHT;
+
+  executeSoon(function() {
+    InspectorUI.treePanel.close();
+    InspectorUI.treePanel.open();
+  });
+}
+
+function treePanelTests2()
+{
+  Services.obs.removeObserver(treePanelTests2,
+    InspectorUI.INSPECTOR_NOTIFICATIONS.TREEPANELREADY);
+
+  ok(InspectorUI.treePanel.isOpen(), "Inspector Tree Panel is open");
+
+  let height = Services.prefs.getIntPref("devtools.inspector.htmlHeight");
+
+  is(InspectorUI.treePanel.container.height, NEWHEIGHT,
+     "Container height is now " + height);
+
+  InspectorUI.treePanel.close();
+  executeSoon(function() {
+    finishInspectorTests()
+  });
+}
+
+function finishInspectorTests()
+{
+  gBrowser.removeCurrentTab();
+  finish();
+}
+
+function test()
+{
+  waitForExplicitFinish();
+  gBrowser.selectedTab = gBrowser.addTab();
+  gBrowser.selectedBrowser.addEventListener("load", function() {
+    gBrowser.selectedBrowser.removeEventListener("load", arguments.callee, true);
+    doc = content.document;
+    waitForFocus(createDocument, content);
+  }, true);
+
+  content.location = "data:text/html;charset=utf-8,browser_inspector_tree_height.js";
+}
+