text: // Copyright 2011-2012 Norbert Lindenberg. All rights reserved.
  // Copyright 2012 Mozilla Corporation. All rights reserved.
  // This code is governed by the BSD license found in the LICENSE file.
  
  /*---
  es5id: 12.1.2
  description: Tests that Intl.DateTimeFormat can be subclassed.
  author: Norbert Lindenberg
  includes: [compareArray.js]
  ---*/
  
  // get a date-time format and have it format an array of dates for comparison with the subclass
  var locales = ["tlh", "id", "en"];
  var a = [new Date(0), Date.now(), new Date(Date.parse("1989-11-09T17:57:00Z"))];
  var referenceDateTimeFormat = new Intl.DateTimeFormat(locales);
  var referenceFormatted = a.map(referenceDateTimeFormat.format);
  
  class MyDateTimeFormat extends Intl.DateTimeFormat {
    constructor(locales, options) {
      super(locales, options);
      // could initialize MyDateTimeFormat properties
    }
    // could add methods to MyDateTimeFormat.prototype
  }
  
  var format = new MyDateTimeFormat(locales);
  var actual = a.map(format.format);
  assert.compareArray(actual, referenceFormatted);
  