diff --git a/test/unit/globals.html b/test/unit/globals.html
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+<!doctype html>
+<!--
+@license
+Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+<html>
+<head>
+  <meta charset="utf-8">
+  <script src="../../../web-component-tester/browser.js"></script>
+  <script src="../../../webcomponentsjs/webcomponents-lite.js"></script>
+  <script>
+    window.origOwnProps = Object.getOwnPropertyNames(window).reduce(function(props, prop) {
+      return props[prop] = true && props;
+    }, {});
+  </script>
+  <link rel="import" href="../../polymer.html">
+<body>
+
+<script>
+
+suite('globals', function() {
+
+  var expected = {
+    origOwnProps: true,
+
+    // Test harness
+    a11ySuite: true,
+    assert: true,
+    expect: true,
+    run: true,
+
+    // Polymer
+    Polymer: true,
+    currentImport: true
+  };
+
+  test('check global leakage', function() {
+    var newProps = Object.getOwnPropertyNames(window).filter(function(prop) {
+      return !origOwnProps[prop] && !expected[prop];
+    });
+    assert.equal(newProps.length, 0, 'new globals added: \n' + newProps.sort().join('\n'));
+  });
+
+});
+
+</script>
+
+</body>
+</html>
