Puppet rspec testing with automatic hiera lookups (implicit hiera lookup like puppet 3.x)

This article is an add-on to my other article regarding puppet & rspec.
This article only covers automatic hiera lookups used during rspec puppet runs.
Many thanks to Jan (janwaech<at>gmail<dot>com) who spend the time digging into rspec-puppet code finding this nice solution.

Debian on MacBook

There is a very good blog article which only lacks some minor information: http://www.adventuresinoss.com/?p=2516

This article adds the required information on how to get grub-efi to work in case of troubles.