old_contents: 'use strict';
  
  module.exports = function(app) {
  app.route('/categories')
    .get(function (request, response) {
      response.json([
        { name: 'Beverages' },
        { name: 'Condiments' }
      ]);
    });
  };
  
new_contents: 'use strict';
  
  module.exports = function(app) {
  
    var categories = require('../../app/controllers/categories.server.controller');
  
    // route for GET categories
    app.route('/categories')
      .get(categories.list);
  };
  
subject: Modify route for Categories GET command.