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+++ b/dom/tests/mochitest/bugs/test_bug393974.html
@@ -0,0 +1,68 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=393974
+-->
+<head>
+  <title>Test for Bug 393974</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=393974">Mozilla Bug 393974</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+function test()
+{
+  // Create a tree walker with a filter which creates a cycle...
+  var tw = document.createTreeWalker(document, NodeFilter.SHOW_ALL,
+                                     function(n)
+                                     {
+                                       // force the closure to contain the
+                                       // global object, in case a future
+                                       // optimization might minimize the
+                                       // function's captured environment
+                                       if ("foo" + window == "fooPIRATES!")
+                                         return NodeFilter.FILTER_ACCEPT;
+                                       return NodeFilter.FILTER_REJECT;
+                                     });
+
+  // That should have been enough to create a leak, but we should do at least
+  // a couple tests while we're here so that this document doesn't show up as
+  // having no tests pass *or* fail.
+
+  ok(tw.firstChild() === null, "shouldn't be a first child");
+  ok(tw.currentNode === document, "should be unchanged");
+
+  ok(tw.lastChild() === null, "shouldn't be a last child");
+  ok(tw.currentNode === document, "should be unchanged");
+
+  ok(tw.nextNode() === null, "shouldn't be a next node");
+  ok(tw.currentNode === document, "should be unchanged");
+
+  ok(tw.nextSibling() === null, "shouldn't be a next sibling");
+  ok(tw.currentNode === document, "should be unchanged");
+
+  ok(tw.parentNode() === null, "shouldn't be a parent node");
+  ok(tw.currentNode === document, "should be unchanged");
+
+  ok(tw.previousNode() === null, "shouldn't be a previous node");
+  ok(tw.currentNode === document, "should be unchanged");
+
+  ok(tw.previousSibling() === null, "shouldn't be a previous sibling");
+  ok(tw.currentNode === document, "should be unchanged");
+}
+
+addLoadEvent(test);
+addLoadEvent(SimpleTest.finish);
+</script>
+</pre>
+</body>
+</html>