It sounds like your use case is property based testing. Have you tried any of the QuickCheck ports to C++? My favorite is RapidCheck (https://github.com/emil-e/

It sounds like your use case is property based testing. Have you tried any of the QuickCheck ports to C++? My favorite is RapidCheck (https://github.com/emil-e/rapidcheck https://github.com/emil-e/rapidcheck). You define generators for your struct fields and write a pure function to check whether the parsed output conforms to your expectations.