old_contents: 'use strict';
  
  const bluebird = require('bluebird');
  
  module.exports.promisify = (fn) => {
      return bluebird.promisify(fn, {
          multiArgs: true
      });
  };
  
  module.exports.asCallBack = (promise, cb) => {
      return bluebird.resolve(promise).asCallback(cb);
  };
  
new_contents: 'use strict';
  
  const bluebird = require('bluebird');
  
  module.exports.promisify = (fn) => {
      return bluebird.promisify(fn, {
          multiArgs: true
      });
  };
  
  module.exports.promisifyAll = (obj) => {
      return bluebird.promisifyAll(obj);
  };
  
  module.exports.asCallBack = (promise, cb) => {
      return bluebird.resolve(promise).asCallback(cb);
  };
  
subject: Add promisifyAll to utils