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+<!DOCTYPE html>
+<!--
+@license
+Copyright (C) 2018 The Android Open Source Project
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+
+<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
+<title>dom-util-behavior</title>
+
+<script src="../../bower_components/webcomponentsjs/webcomponents.min.js"></script>
+<script src="../../bower_components/web-component-tester/browser.js"></script>
+<link rel="import" href="../../test/common-test-setup.html"/>
+<link rel="import" href="dom-util-behavior.html">
+
+<test-fixture id="nested-structure">
+  <template>
+    <test-element></test-element>
+    <div>
+      <div class="a">
+        <div class="b">
+          <div class="c"></div>
+        </div>
+      </div>
+    </div>
+  </template>
+</test-fixture>
+
+<script>
+  suite('dom-util-behavior tests', () => {
+    let element;
+    let divs;
+
+    suiteSetup(() => {
+      // Define a Polymer element that uses this behavior.
+      Polymer({
+        is: 'test-element',
+        behaviors: [Gerrit.DomUtilBehavior],
+      });
+    });
+
+    setup(() => {
+      const testDom = fixture('nested-structure');
+      element = testDom[0];
+      divs = testDom[1];
+    });
+
+    test('descendedFromClass', () => {
+      // .c is a child of .a and not vice versa.
+      assert.isTrue(element.descendedFromClass(divs.querySelector('.c'), 'a'));
+      assert.isFalse(element.descendedFromClass(divs.querySelector('.a'), 'c'));
+
+      // Stops at stop element.
+      assert.isFalse(element.descendedFromClass(divs.querySelector('.c'), 'a',
+          divs.querySelector('.b')));
+    });
+  });
+</script>