diff -r 000000000000 -r 6474c204b198 browser/devtools/sourceeditor/test/browser_codemirror.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/sourceeditor/test/browser_codemirror.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,38 @@
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const HOST = 'mochi.test:8888';
+const URI  = "http://" + HOST + "/browser/browser/devtools/sourceeditor/test/codemirror.html";
+
+function test() {
+  requestLongerTimeout(3);
+  waitForExplicitFinish();
+
+  let tab = gBrowser.addTab();
+  gBrowser.selectedTab = tab;
+
+  let browser = gBrowser.getBrowserForTab(tab);
+  browser.loadURI(URI);
+
+  function check() {
+    var win = browser.contentWindow.wrappedJSObject;
+    var doc = win.document;
+    var out = doc.getElementById("status");
+    if (out && !win.mozilla_setStatus)
+      win.mozilla_setStatus = codeMirror_setStatus;
+
+    if (!out || !out.classList.contains("done"))
+      return void setTimeout(check, 100);
+
+    ok(!win.failed, "CodeMirror tests all passed");
+    win.mozilla_setStatus = null;
+
+    while (gBrowser.tabs.length > 1) gBrowser.removeCurrentTab();
+    finish();
+  }
+
+  setTimeout(check, 100);
+}