Once you have your module then install the development dependencies:
cd puppet-ossec
gem install bundler --no-rdoc --no-ri
bundle install
Now you should have a bunch of rake commands to help with your module development:
bundle exec rake -T
rake acceptance # Run all acceptance tests: Will load module dependencies, then start all VMs in serial and execute tests ...
rake lint # Check puppet manifests for lint errors
rake unit # Run all unit tests
rake vagrant_prep # Loads / refreshes this module and module dependencies in preparation for Vagrant provisioning