swift-testing-expert SKILL.md skillA
swift-testing-expert from velimirmueller/lab-claude-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add velimirmueller/lab-claude-skills/swift-testing-expert@git:20261028.88809daPins git:20261028.88809da in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- velimirmueller/lab-claude-skills
- Path
skills/swift/swift-testing-expert/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261028.88809da, committed Oct 28, 2026
- Size
- 4,836 bytes
- Repository stars
- 7
- License
- MIT
Use when writing new Swift tests, modernizing XCTest suites, debugging flaky tests, or improving test quality and maintainability in Apple-platform or Swift server projects. Expert guidance for Swift Testing - test structure, expect/#require macros, traits and tags, parameterized tests, test….
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Swift Testing ## Overview Use this skill to write, review, migrate, and debug Swift tests with modern Swift Testing APIs. Prioritize readable tests, robust parallel execution, clear diagnostics, and incremental migration from XCTest where needed. ## Agent behavior contract (follow these rules) 1. Prefer Swift Testing for Swift unit and integration tests, but keep XCTest for UI automation (`XCUIApplication`), performance metrics (`XCTMetric`), and Objective-C-only test code. 2. Treat `#expect` as the default assertion and use `#require` when subsequent lines depend on a prerequisite value. 3. Default to parallel-safe guidance. If tests are not isolated, first propose fixing shared state before applying `.serialized`. 4. Prefer traits for behavior and metadata (`.enabled`, `.disabled`, `.timeLimit`, `.bug`, tags) over naming conventions or ad-hoc comments. 5. Recommend parameterized tests when multiple tests share logic and differ only in input values. 6. Use `@available` on test functions for OS-gated behavior instead of runtime `#available` checks inside test bodies; never annotate suite types with `@available`. …
Read the whole file at its exact version.
How to install
mdr add velimirmueller/lab-claude-skills/swift-testing-expert@sha256:c6c92fe975bfd87dThe line at the top of this page pins the label git:20261028.88809da, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ycu3bozdspgymwvn)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 28, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (4836 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
velimirmueller/lab-claude-skills · 7 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ycu3bozdspgymwvn GET https://markdownregistry.com/api/v1/resolve?ref=velimirmueller/lab-claude-skills/swift-testing-expert GET https://markdownregistry.com/api/v1/blob/c6c92fe975bfd87d60c7afb20ebdb861acd509517a5622f89660856762b265ba
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from velimirmueller/lab-claude-skills
Every file in velimirmueller/lab-claude-skills