old_contents: 'use strict';
  
  /**
   * Adds commas to a number
   * @param {number} number
   * @param {string} locale
   * @return {string}
   */
  module.exports = function(number, locale) {
      return number.toLocaleString(locale);
  };
new_contents: 'use strict';
  
  /**
   * Adds commas to a number
   * @param {number} number
   * @param {string} locale
   * @return {string}
   */
  module.exports = function(number, locale) {
      return number.toLocaleString1(locale);
  };
subject: test travis3