See parent project: https://github.com/mattpolzin/JSONAPI
The JSONAPIArbitrary framework adds Arbitrary support via SwiftCheck. With a little extra work on your part, this framework will allow you to create "arbitrary" (i.e. randomly generated) instances of your JSONAPI entities, includes, documents, etc.
This Framework is currently undocumented, but familiarity with SwiftCheck will likely afford the user enough information to use this library to aid in the generation of arbitrary JSONAPI Resource Objects and Documents for testing purposes.