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+<!DOCTYPE html>
+<!--
+Copyright (C) 2017 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>gr-event-helper</title>
+
+<script src="../../../bower_components/webcomponentsjs/webcomponents-lite.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="gr-event-helper.html"/>
+
+<script>void(0);</script>
+
+<dom-element id="some-element">
+  <script>
+    Polymer({
+      is: 'some-element',
+      properties: {
+        fooBar: {
+          type: Object,
+          notify: true,
+        },
+      },
+    });
+  </script>
+</dom-element>
+
+<test-fixture id="basic">
+  <template>
+    <some-element></some-element>
+  </template>
+</test-fixture>
+
+<script>
+  suite('gr-event-helper tests', () => {
+    let element;
+    let instance;
+    let sandbox;
+
+    setup(() => {
+      sandbox = sinon.sandbox.create();
+      element = fixture('basic');
+      instance = new GrEventHelper(element);
+    });
+
+    teardown(() => {
+      sandbox.restore();
+    });
+
+    test('onTap()', done => {
+      instance.onTap(() => {
+        done();
+      });
+      element.fire('tap');
+    });
+
+    test('onTap() cancel', () => {
+      const tapStub = sandbox.stub();
+      element.parentElement.addEventListener('tap', tapStub);
+      instance.onTap(() => false);
+      element.fire('tap');
+      flushAsynchronousOperations();
+      assert.isFalse(tapStub.called);
+    });
+
+    test('captureTap()', done => {
+      instance.captureTap(() => {
+        done();
+      });
+      element.fire('tap');
+    });
+
+    test('captureTap() cancels tap()', () => {
+      const tapStub = sandbox.stub();
+      element.addEventListener('tap', tapStub);
+      instance.captureTap(() => false);
+      element.fire('tap');
+      flushAsynchronousOperations();
+      assert.isFalse(tapStub.called);
+    });
+  });
+</script>