Testing Async Code — Swift Testing Patterns

Modern patterns for testing async/await code with Swift Testing framework.

When to Use

✅ Use when:

• Writing tests for async functions
• Testing callback-based APIs with Swift Testing
• Migrating async XCTests to Swift Testing
• Testing MainActor-isolated code
• Need to verify events fire expected number of times

❌ Don't use when:

• XCTest-only project (use XCTestExpectation)
• UI automation tests (use XCUITest)
• Performance testing with metrics (use XCTest)

Key Differences from XCTest