First, run
git clone git@github.com:ibuildingsnl/coding-dojo.git
Inside the coding-dojo directory, run
composer install
(assuming you have Composer installed globally).
Put your classes in src/, your PHPUnit tests in test/.
The root namespace in src/ is CodingDojo, in 'test/' it's CodingDojo\Test.
To run the unit tests:
vendor/bin/phpunit