We turn Papertrail off in the equivalent of a global `before :all` block [here](https://github.com/alphagov/transition/blob/master/spec/spec_helper.rb#L48). You can remove this method and add the RSpec metadata `versioning: true` to the block you want PaperTrail turned on for below.  Example [here](https://github.com/alphagov/transition/blob/master/spec/controllers/mappings_controller_spec.rb#L129)