Currently facter has `spec` and `spec_integration` directories for unit and integration tests. Each folder has a `spec_helper.rb` which duplicates the common rspec config. We could unify this if we restructure the folders as:
facter
└── spec
├── spec_helper.rb # common config
├── integration
│ └── spec_helper.rb # integration specific config
└── unit
└── spec_helper.rb # unit specific config
And update the rake task to run accordingly to the new structure