Testing You MUST use this skill for ANY testing-related question, including writing tests, debugging test failures, making tests faster, or choosing between testing approaches. Quick Reference | Symptom / Task | Reference | |----------------|-----------| | Writing unit tests, Swift Testing (@Test, #expect) | See | | Making tests run without simulator | See | | Parameterized tests, tags, traits | See | | Migrating from XCTest to Swift Testing | See | | Testing async/await functions | See | | confirmation for callbacks | See | | @MainActor tests, parallel execution | See | | Writing UI tests, X…