text: /**
   * @license
   * Copyright 2016 Google Inc. All rights reserved.
   *
   * 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.
   */
  'use strict';
  
  const Audit = require('./audit');
  
  class WorksOffline extends Audit {
    /**
     * @return {!AuditMeta}
     */
    static get meta() {
      return {
        category: 'Offline',
        name: 'works-offline',
        description: 'Responds with a 200 when offline',
        helpText: 'If you\'re building a Progressive Web App, consider using a service worker so ' +
            'that your app can work offline. ' +
            '[Learn more](https://developers.google.com/web/tools/lighthouse/audits/http-200-when-offline).',
        requiredArtifacts: ['Offline']
      };
    }
  
    /**
     * @param {!Artifacts} artifacts
     * @return {!AuditResult}
     */
    static audit(artifacts) {
      return WorksOffline.generateAuditResult({
        rawValue: artifacts.Offline === 200
      });
    }
  }
  
  module.exports = WorksOffline;
  