Ok that i understand completely but before with pdk the spec structure looked like this: spec/(classes,defines,...) spec/fixtures/hiera.yaml -> hiera config spec/fixtures/data/common.yaml -> file with with some values in it to lookup spec/default_facts.yaml -> with some default values like memory, network or some custom facts -> same for every module Now i don't really see where i should define this or how i can add and use this for my unit tests