What is the main benefit of this skill for Swift developers?

It provides deterministic patterns for testing asynchronous code, replacing flaky sleep-based waits with modern Swift Testing tools like confirmation and expectedCount.

Does it support @MainActor isolated tests?

Yes, it provides clear patterns for testing code isolated to the MainActor, which is critical for verifying ViewModel and UI-related logic safely.

Can this skill help me migrate from XCTest?

Yes, it includes specific mapping and code patterns for converting XCTestExpectations, setup methods, and assertions to the Swift Testing framework syntax.

How does it handle parallel test execution?

The skill provides guidance on managing shared state between tests and explains how to use the .serialized trait for tests that must run sequentially.

Swift Async Testing Patterns

Name: Swift Async Testing Patterns
Author: CharlesWiltgen

byCharlesWiltgen

•

233

Mobile Development

Provides modern patterns and best practices for testing asynchronous Swift code using the Swift Testing framework.

概要

This skill equips Claude with specialized knowledge of the Swift Testing framework to handle complex asynchronous scenarios in modern Apple platform development. It provides implementation patterns for testing async/await functions, handling completion-to-continuation conversions, managing parallel test execution, and migrating legacy XCTest suites to the new Swift Testing paradigm. By following these battle-tested patterns, developers can ensure robust, deterministic, and thread-safe test suites for iOS, iPadOS, macOS, and other xOS platforms.

主な機能

Async/await test pattern implementation
Parallel execution and shared state management
Swift Testing confirmation for callback verification
XCTest to Swift Testing migration guides
MainActor isolation for UI-related unit tests
233 GitHub stars

ユースケース

Migrating an existing iOS project's test suite from XCTest to Swift Testing
Testing complex delegate patterns or notification-based events using confirmation
Ensuring thread safety and isolation in parallel test suites

概要

主な機能

Async/await test pattern implementation
Parallel execution and shared state management
Swift Testing confirmation for callback verification
XCTest to Swift Testing migration guides
MainActor isolation for UI-related unit tests
233 GitHub stars

ユースケース

Migrating an existing iOS project's test suite from XCTest to Swift Testing
Testing complex delegate patterns or notification-based events using confirmation
Ensuring thread safety and isolation in parallel test suites