In order to run run these challenges you'll need to visit http://nodeschool.io/#workshoppers and install the appropriate workshop.
For example, running npm install -g learnyounode will allow you to run:
-
learnyounode to see a list of all challenges for that workshop
-
learnyounode help to see all available commands for the learnyounode workshop
-
And learnyounode verify my_app.js to run the built-in test suite against my_app.js