Swift Testing
Master Swift Testing, the modern framework for Swift unit tests in Xcode 16+. Learn to write tests with @Test and @Suite, use #expect and #require for assertions, organize tests with traits, handle async patterns, and migrate from XCTest. This skill covers test attachments, exit testing, known issues, and version-gated APIs to help you build reliable test suites.
Swift Testing skill teaches you to write and organize unit tests for Swift applications using the modern Testing framework.
AI-generated summary based on this skill's SKILL.md
Decision gist · record as of 2026-07-15
Swift Testing skill teaches you to write and organize unit tests for Swift applications using the modern Testing framework. Master Swift Testing, the modern framework for Swift unit tests in Xcode 16+. Learn to write tests with @Test and @Suite, use #expect and #require for assertions, organize tests with traits, handle async patterns, and migrate from XCTest. This skill covers test attachments, exit testing, known issues, and version-gated APIs to help you build reliable test suites.
Use it when
- Swift Testing simplifies setup in Xcode 16+.
- Swift Testing includes @Test and @Suite macros for organization, #expect and #require for assertions.
Install
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Frequently asked questions
AI-generated answers based on this skill's SKILL.md and metadata
What is Swift Testing and how does it differ from XCTest?
Swift Testing is the modern framework for Swift unit tests in Xcode 16+. Unlike XCTest, Swift Testing uses the @Test and @Suite macros for cleaner test organization, #expect and #require for assertions, and traits for flexible test categorization. It natively supports async/await patterns, offers better error messages, and provides a more intuitive API designed for contemporary Swift development.
How do I set up and run unit tests for Swift applications?
Swift Testing simplifies setup in Xcode 16+. Create test files with @Suite to group related tests, then mark individual test functions with @Test. Use #expect for assertions and #require to fail fast on critical conditions. Run tests via Xcode's test navigator or command line with `swift test`. Swift Testing handles async test execution automatically, eliminating boilerplate compared to XCTest.
What are the key features of the Swift testing framework?
Swift Testing includes @Test and @Suite macros for organization, #expect and #require for assertions, traits for tagging and filtering tests, native async/await support, test attachments for debugging, exit testing for process validation, and known issues tracking. It also provides version-gated APIs to ensure compatibility across Swift versions while enabling modern features in newer environments.
How can I automate testing workflows in Swift projects?
Swift Testing enables automation through traits that categorize tests by tags, performance characteristics, or custom metadata. Organize tests with @Suite for logical grouping, use #expect assertions for clear validation, and leverage async support for concurrent test execution. Integrate with CI/CD pipelines using `swift test` commands, and attach diagnostic data to failures for automated debugging and reporting.
What resources help me learn Swift testing frameworks and methodologies?
Swift Testing documentation covers writing tests with @Test, organizing with @Suite, using #expect/#require assertions, handling async patterns, and migrating from XCTest. Learn best practices for test attachments, exit testing, and known issues management. The framework's design emphasizes readable, maintainable tests aligned with modern Swift idioms, making it ideal for developers building reliable test suites.
How do I debug and validate Swift code quality with testing?
Swift Testing supports code quality validation through assertions (#expect, #require), test attachments for capturing diagnostic data during failures, and exit testing for process-level validation. Traits enable filtering tests by performance or custom criteria. Known issues tracking helps manage expected failures. These tools combined help identify bugs early, ensure reliability, and maintain high code quality standards.
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