message: chore(license): add license header to test
diff: +/**
  + * @license
  + *
  + * Copyright IBM Corp. 2019
  + *
  + * This source code is licensed under the Apache-2.0 license found in the
  + * LICENSE file in the root directory of this source tree.
  + */
  +
  import { html, render, TemplateResult } from 'lit-html';
  import EventManager from '../utils/event-manager';
  import '../../src/components/accordion/accordion';
  