WWDC 2026 - Migrate to Swift Testing: What Actually Means for Your Test Suite (opens in new tab)

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 ...