swift-testing

Migrate XCTest projects to Swift Testing with macros and async tests.

223|21|Updated Dec 20, 2025
One-click install
npx skills add https://github.com/johnrogers/claude-swift-engineering --skill swift-testing-johnrogers
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: swift-testing
Source: https://github.com/johnrogers/claude-swift-engineering/tree/main/plugins/swift-engineering/skills/swift-testing
Command: npx skills add https://github.com/johnrogers/claude-swift-engineering --skill swift-testing-johnrogers

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Swift projects typically rely on XCTest, which can be verbose and limited for async testing. This skill provides a modern Testing framework with concise macros, migration support, and parallel test execution.

Core Features & Use Cases

  • Macro-based assertions like #expect and #require to balance thoroughness and early failure stops.
  • Async testing and structured test organization with @Suite and @Test; parameterized tests; easy migration from XCTest.
  • Cross-platform (iOS/macOS) testing workflows with parallel execution and clear error reporting.

Quick Start

Install the swift-testing skill and begin writing tests with @Test and #expect in your Swift modules.

Frequently Asked Questions about swift-testing

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I migrate from XCTest to the modern Swift Testing framework?

To migrate from XCTest, you replace XCTest classes with structured test definitions using @Suite and @Test macros. This enables concise, modern Swift tests with macro-based assertions like #expect and #require.

Can I write asynchronous unit tests in Swift using the Testing framework?

Yes, the Swift Testing framework supports asynchronous tests natively. You can write async tests directly within @Test attributes across iOS and macOS projects without XCTest's verbose async expectations.

What is the best way to run parameterized tests in Swift?

The best way to run parameterized tests in Swift is using the modern Testing framework. It supports parameterized test definitions via @Test, allowing you to run the same logic across multiple inputs concurrently.

Does the modern Swift Testing framework support parallel test execution?

Yes, the Swift Testing framework supports parallel test execution natively. It runs parameterized and structured tests concurrently across iOS and macOS projects, delivering faster feedback than sequential XCTest runs.

What is the difference between #expect and #require in Swift Testing?

In Swift Testing, #expect continues execution after a failure to collect multiple errors, while #require stops test execution immediately upon failure, providing early failure detection for critical assertions.

Can I use Swift Testing for both unit and integration tests on macOS?

Yes, you can use Swift Testing for both unit and integration tests on macOS and iOS. The framework applies structured @Suite and @Test definitions to organize and execute tests across complex workflows.