diff -r 000000000000 -r 6474c204b198 content/base/test/unit/head_utilities.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/base/test/unit/head_utilities.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,36 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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/. */
+
+Components.utils.import("resource://testing-common/httpd.js");
+
+const nsIDocumentEncoder = Components.interfaces.nsIDocumentEncoder;
+const replacementChar = Components.interfaces.nsIConverterInputStream.DEFAULT_REPLACEMENT_CHARACTER;
+
+function loadContentFile(aFile, aCharset) {
+    //if(aAsIso == undefined) aAsIso = false;
+    if(aCharset == undefined)
+        aCharset = 'UTF-8';
+
+    var file = do_get_file(aFile);
+    var ios = Components.classes['@mozilla.org/network/io-service;1']
+            .getService(Components.interfaces.nsIIOService);
+    var chann = ios.newChannelFromURI ( ios.newFileURI (file) );
+    chann.contentCharset = aCharset;
+
+    /*var inputStream = Components.classes["@mozilla.org/scriptableinputstream;1"]
+                        .createInstance(Components.interfaces.nsIScriptableInputStream);
+    inputStream.init(chann.open());
+    return inputStream.read(file.fileSize);
+    */
+
+    var inputStream = Components.classes["@mozilla.org/intl/converter-input-stream;1"]
+                       .createInstance(Components.interfaces.nsIConverterInputStream);
+    inputStream.init(chann.open(), aCharset, 1024, replacementChar);
+    var str = {}, content = '';
+    while (inputStream.readString(4096, str) != 0) {
+        content += str.value;
+    }
+    return content;
+}