old_contents: 'use strict';
  
  module.exports = (parent) => {
      require('./install')();
      
      require('./controllers/setting')(parent);
  };
new_contents: 'use strict';
  
  module.exports = (parent) => {
      require('./install')();
  
      require('./controllers/servers')(parent);
      require('./controllers/setting')(parent);
  };
subject: add new controller