Swift Testing shipped with Xcode 16 back in 2024.
Swift Testing was built from the ground up for Swift. That means Swift concurrency is a first-class citizen, test cases run in parallel by default, and the API surface is dramatically smaller than XCTest's forty-plus assertion functions. One macro, #expect, replaces most of them.
If you are still on XCTest, you have probably felt the friction: class inheritance for every test suite, function names that must start with test, assertion messages that tell you what the values were but not where the expression came from. Swift Testing fixes all of this.
That said, you do not need to migrate everything at once, and WWDC 2026 is emphatic about this.
The Migration Strategy: Small Chunks, No Big Bang
