text: 
  const app = require( './app' );
  
  process.env.PORT = process.env.PORT || 3001;
  
  const server = app.listen( process.env.PORT, '0.0.0.0', () => {
    console.log( `Server running at ${ JSON.stringify( server.address() ) }` );
  });
  
  module.exports = server;
  