roy-wonji/claude-config/guide-swift-testing

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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.

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SKILL.md

The same SKILL.md was published earlier as prisma-labs-dev/apple-skills/guide-swift-testing.

Guide Skill — This is an expert workflow/pattern guide, not API reference documentation.
Originally from 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

TopicReference
Structs over classes, @Suite, parallel execution, withKnownIssue, tagsreferences/core-rules.md
Test hygiene, structure, DI, #expect vs #require, Issue.record(), verification methodsreferences/writing-better-tests.md
Serialized tests, confirmation(), time limits, actor isolation, mocking networkingreferences/async-tests.md
Raw identifiers, exit tests, attachments, test scoping traits, range-based confirmationsreferences/new-features.md
XCTest-to-Swift Testing conversion, assertion mappings, floating-point tolerancereferences/migrating-from-xctest.md

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