Migrating XCTest to Swift Testing

Convert your entire test suite in minutes

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Swift Testing, introduced with Xcode 16, was one of the neatest additions to our iOS engineering toolkit in a long time.

Building on similar foundations to SwiftData the year before, it utilised macros to offer clean, flexible, expressive APIs for our tests.

I naturally wanted to convert Bev, my handy battle-hardened sample project. But I wanted to make it more useful than that:

I wanted to create something you could apply yourself to any-sized codebases, to migrate in minutes and not months.

I discovered how to migrate my entire test suite from XCTest to Swift Testing semi-automatically. I’ve come up with a set of techniques that can apply to your entire codebase at once.

We’ll start with the low-hanging fruit and work outwards to the more complex edge-cases.