WWDC 2026 - Migrate to Swift Testing: What Actually Means for Your Test Suite

Short summary

Swift Testing (Xcode 16+) replaces XCTest with a modern framework supporting parallel execution, first-class Swift concurrency, and a minimal API. WWDC 2026 recommends incremental migration: leave existing XCTests alone, write new tests in Swift Testing, and use interoperability modes to manage cross-framework friction. Key features include parameterized tests, trait-based test conditions, and fine-grained failure control via #require vs #expect.

• •Swift Testing is the modern alternative to XCTest with parallel execution and better Swift concurrency support
• •Migrate incrementally—keep existing XCTests and write new tests in Swift Testing; both can coexist
• •Use interoperability modes (Limited/Complete/Strict) to manage cross-framework issues, and leverage new features like parameterized tests and trait-based conditions

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