diff -r 000000000000 -r 6474c204b198 browser/devtools/markupview/test/browser_markupview_textcontent_edit_01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/markupview/test/browser_markupview_textcontent_edit_01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+/* 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";
+
+// Test editing a node's text content
+
+const TEST_URL = TEST_URL_ROOT + "doc_markup_edit.html";
+
+let test = asyncTest(function*() {
+  let {inspector} = yield addTab(TEST_URL).then(openInspector);
+
+  info("Expanding all nodes");
+  yield inspector.markup.expandAll();
+
+  let node = getNode(".node6").firstChild;
+  is(node.nodeValue, "line6", "The test node's text content is correct");
+
+  info("Changing the text content");
+
+  info("Listening to the markupmutation event");
+  let onMutated = inspector.once("markupmutation");
+  let editor = getContainerForRawNode(node, inspector).editor;
+  let field = editor.elt.querySelector("pre");
+  setEditableFieldValue(field, "New text", inspector);
+  yield onMutated;
+
+  is(node.nodeValue, "New text", "Test test node's text content has changed");
+
+  yield inspector.once("inspector-updated");
+});