Does this skill help with migrating from XCTest?

Absolutely. It provides patterns for replacing XCTAssert with #expect and #require, as well as converting class-based suites into modern struct-based @Suites.

How does this skill help with test execution speed?

It provides architectural guidance to move logic into Swift Packages or frameworks, allowing tests to run in seconds by bypassing the iOS simulator and app launch overhead.

What makes Swift Testing different from XCTest?

Swift Testing uses macros like @Test and #expect instead of naming conventions, supports parameterized tests natively, and runs tests in parallel by default for better performance.

Can I test asynchronous code with this skill?

Yes, it covers testing async functions, using confirmations for callbacks, and advanced techniques like TestClock for deterministic concurrency testing.

Swift Testing Framework (Axiom)

Name: Swift Testing Framework (Axiom)
Author: CharlesWiltgen

byCharlesWiltgen

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233

Mobile Development

Optimizes iOS and macOS development by implementing Apple's modern Swift Testing framework with a focus on speed and testability.

About

axiom-swift-testing is a specialized Claude Code skill designed to help developers adopt and master Apple's Swift Testing framework introduced at WWDC 2024. It provides deep domain knowledge on using @Test and @Suite macros, implementing parameterized tests, and architecting xOS applications for maximum testing speed—often bypassing the simulator entirely. Whether you are migrating from XCTest or building new async-heavy features, this skill ensures your test suite is expressive, parallelizable, and highly maintainable.

Key Features

Optimization strategies for host-less and package-based testing
XCTest to Swift Testing migration patterns
Deterministic async testing using TestClock and serial executors
Implementation of modern @Test and @Suite macros
Advanced parameterized testing and trait configuration
233 GitHub stars

Use Cases

Migrating a legacy XCTest suite to the modern Swift Testing framework
Writing reliable, non-flaky tests for complex Swift Concurrency code
Architecting a project to run business logic tests without an app simulator

About

Key Features

Optimization strategies for host-less and package-based testing
XCTest to Swift Testing migration patterns
Deterministic async testing using TestClock and serial executors
Implementation of modern @Test and @Suite macros
Advanced parameterized testing and trait configuration
233 GitHub stars

Use Cases

Migrating a legacy XCTest suite to the modern Swift Testing framework
Writing reliable, non-flaky tests for complex Swift Concurrency code
Architecting a project to run business logic tests without an app simulator