Using recommendations from the following url:

https://www.terlici.com/2014/09/15/node-testing.html

https://www.terlici.com/2015/04/03/mongodb-node-express.html

https://www.terlici.com/2015/04/03/mongodb-node-express.html

https://www.terlici.com/2015/09/21/node-express-controller-testing.html

https://www.terlici.com/2014/08/25/best-practices-express-structure.html

To start the application use the following command DB=prueba DEBUG=myexpress:* npm start