Swift Testing

Write deterministic tests around observable behavior and keep the framework choice proportional to the target and API under test.

Contents

• Scope and Preflight
• Framework Choice
• Core Patterns
• Async and Failure Behavior
• Advanced and Version-Gated APIs
• Migration
• Common Mistakes
• Review Checklist
• References

Scope and Preflight

This skill owns Swift Testing syntax, suite organization, traits, parameterization, async tests, known issues, attachments, exit tests, and XCTest migration boundaries. Route UI implementation to UI skills and concurrency design—not merely async test syntax—to swift-concurrency.