swift-checkit | library containing validators

swift-checkit is a Swift library. swift-checkit has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

Swift-checkit is a library containing validators which exercise common protocols. This all started because I hit a bug recently: on one of my custom collections, incrementing startIndex by count returned nil, rather than the expected endIndex. I never noticed this before, because all of my real-world code incremented indices by +/-1, and never in steps larger than that. Nonetheless, there were expected, documented semantics and generic code was relying on that. Swift's protocols aren't just bags of syntax; there is some expected behaviour attached to each of them. Sometimes those expectations can be reflected in the type-system, but sometimes they have to be explained in documentation and left to the programmer. That's fine - but as software becomes more complex, it's easy to make changes which accidentally violate some subtle semantics of the protocol. That's why we write tests. Swift-checkit has some helpful pre-made tests to make that easier.