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diff --git a/editor/libeditor/tests/test_bug1386222.xhtml b/editor/libeditor/tests/test_bug1386222.xhtml
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+++ b/editor/libeditor/tests/test_bug1386222.xhtml
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+<?xml version="1.0"?>
+<?xml-stylesheet href="chrome://global/skin"
+ type="text/css"?>
+<?xml-stylesheet href="chrome://mochikit/content/tests/SimpleTest/test.css"
+ type="text/css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1386222
+-->
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+ title="Mozilla Bug 1386222" onload="runTest();">
+ <script src="chrome://mochikit/content/tests/SimpleTest/EventUtils.js"/>
+ <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+
+ <input xmlns="http://www.w3.org/1999/xhtml" id="t"/>
+ <script class="testbody" type="application/javascript">
+ <![CDATA[
+
+function runTest() {
+ var t = document.getElementById("t");
+ var numUndo = () => t.editor.transactionManager.numberOfUndoItems;
+ is(numUndo(), 0, "no undo items to begin with");
+ t.value = "foo";
+ is(t.value, "foo", "value setter worked");
+ is(numUndo(), 1, "one undo item now");
+ SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+]]>
+</script>
+</window>