diff -r 000000000000 -r 6474c204b198 browser/devtools/sourceeditor/test/head.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/sourceeditor/test/head.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,110 @@
+/* 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 { devtools } = Cu.import("resource://gre/modules/devtools/Loader.jsm", {});
+const { require } = devtools;
+const Editor  = require("devtools/sourceeditor/editor");
+
+gDevTools.testing = true;
+SimpleTest.registerCleanupFunction(() => {
+  gDevTools.testing = false;
+});
+
+function setup(cb) {
+  const opt = "chrome,titlebar,toolbar,centerscreen,resizable,dialog=no";
+  const url = "data:text/xml;charset=UTF-8,<?xml version='1.0'?>" +
+    "<?xml-stylesheet href='chrome://global/skin/global.css'?>" +
+    "<window xmlns='http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul'" +
+    " title='Editor' width='600' height='500'><box flex='1'/></window>";
+
+  let win = Services.ww.openWindow(null, url, "_blank", opt, null);
+
+  win.addEventListener("load", function onLoad() {
+    win.removeEventListener("load", onLoad, false);
+
+    waitForFocus(function () {
+      let box = win.document.querySelector("box");
+      let editor = new Editor({
+        value: "Hello.",
+        lineNumbers: true,
+        foldGutter: true,
+        gutters: [ "CodeMirror-linenumbers", "breakpoints", "CodeMirror-foldgutter" ]
+      });
+
+      editor.appendTo(box)
+        .then(() => cb(editor, win))
+        .then(null, (err) => ok(false, err.message));
+    }, win);
+  }, false);
+}
+
+function ch(exp, act, label) {
+  is(exp.line, act.line, label + " (line)");
+  is(exp.ch, act.ch, label + " (ch)");
+}
+
+function teardown(ed, win) {
+  ed.destroy();
+  win.close();
+  finish();
+}
+
+/**
+ * This method returns the portion of the input string `source` up to the
+ * [line, ch] location.
+ */
+function limit(source, [line, ch]) {
+  line++;
+  let list = source.split("\n");
+  if (list.length < line)
+    return source;
+  if (line == 1)
+    return list[0].slice(0, ch);
+  return [...list.slice(0, line - 1), list[line - 1].slice(0, ch)].join("\n");
+}
+
+function read(url) {
+  let scriptableStream = Cc["@mozilla.org/scriptableinputstream;1"]
+    .getService(Ci.nsIScriptableInputStream);
+
+  let channel = Services.io.newChannel(url, null, null);
+  let input = channel.open();
+  scriptableStream.init(input);
+
+  let data = "";
+  while (input.available()) {
+    data = data.concat(scriptableStream.read(input.available()));
+  }
+  scriptableStream.close();
+  input.close();
+
+  return data;
+}
+
+/**
+ * This function is called by the CodeMirror test runner to report status
+ * messages from the CM tests.
+ * @see codemirror.html
+ */
+function codeMirror_setStatus(statusMsg, type, customMsg) {
+  switch (type) {
+    case "expected":
+    case "ok":
+      ok(1, statusMsg);
+      break;
+    case "error":
+    case "fail":
+      ok(0, statusMsg);
+      break;
+    default:
+      info(statusMsg);
+      break;
+  }
+
+  if (customMsg && typeof customMsg == "string" && customMsg != statusMsg) {
+    info(customMsg);
+  }
+}