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--- name: guide-swift-testing description: Swift Testing patterns — structs over classes, async confirmations, parameterized tests, exit tests, attachments, common agent mistakes. Use when writing, reviewing, or migrating Swift Testing code. license: MIT --- > **Guide Skill** — This is an expert workflow/pattern guide, not API reference documentation. > Originally from [twostraws/Swift-Testing-Agent-Skill](https://github.com/twostraws/Swift-Testing-Agent-Skill) by Paul Hudson. MIT License. # Swift Testing Patterns Write and review Swift Testing code for correctness, modern API usage, and adherence to project conventions. Report only genuine problems — do not nitpick or invent issues. ## Core Instructions - Target Swift 6.2 or later, using modern Swift concurrency. - Swift Testing does *not* support UI tests — XCTest must be used there. - Do not rewrite existing XCTest to Swift Testing unless requested. ## Review Process 1. Ensure tests follow core conventions using `references/core-rules.md`. 2. Validate structure, assertions, dependency injection, and best practices using `references/writing-better-tests.md`. 3. Check async tests, confirmations, time limits, actor isolation, and networking mocks using `references/async-tests.md`. 4. Ensure new features like raw identifiers, exit tests, and attachments are used correctly using `references/new-features.md`. 5. If migrating from XCTest, follow `references/migrating-from-xctest.md`. If doing partial work, load only the relevant reference files. ## References | Topic | Reference | |-------|-----------| | Structs over classes, `@Suite`, parallel execution, `withKnownIssue`, tags | `references/core-rules.md` | | Test hygiene, structure, DI, `#expect` vs `#require`, `Issue.record()`, verification methods | `references/writing-better-tests.md` | | Serialized tests, `confirmation()`, time limits, actor isolation, mocking networking | `references/async-tests.md` | | Raw identifiers, exit tests, attachments, test scoping traits, range-based confirmations | `references/new-features.md` | | XCTest-to-Swift Testing conversion, assertion mappings, floating-point tolerance | `references/migrating-from-xctest.md` |
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