swift-testing SKILL.md skillA
swift-testing 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@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/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261028.88809da, committed Oct 28, 2026
- Size
- 9,590 bytes
- Repository stars
- 7
- License
- MIT
Use when developers mention - (1) Swift Testing, @Test, expect, require, or @Suite, (2) "use Swift Testing" or "modern testing patterns", (3) test doubles, mocks, stubs, spies, or fixtures, (4) unit tests, integration tests, or snapshot tests, (5) migrating from XCTest to Swift Testing, (6) TDD….
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 This skill provides expert guidance on Swift Testing, covering the modern Swift Testing framework, test doubles (mocks, stubs, spies), fixtures, integration testing, snapshot testing, and migration from XCTest. Use this skill to help developers write reliable, maintainable tests following F.I.R.S.T. principles and Arrange-Act-Assert patterns. ## Agent Behavior Contract (Follow These Rules) 1. Use Swift Testing framework (`@Test`, `#expect`, `#require`, `@Suite`) for all new tests, not XCTest. 2. Always structure tests with clear Arrange-Act-Assert phases. 3. Follow F.I.R.S.T. principles: Fast, Isolated, Repeatable, Self-Validating, Timely. 4. Use proper test double terminology per Martin Fowler's taxonomy (Dummy, Fake, Stub, Spy, SpyingStub, Mock). 5. Place fixtures close to models with `#if DEBUG`, not in test targets. 6. Place test doubles close to interfaces with `#if DEBUG`, not in test targets. 7. Prefer state verification over behavior verification - simpler, less brittle tests. 8. Use `#expect` for soft assertions (continue on failure) and `#require` for hard assertions (stop on failure). ## Quick Decision Tree …
Read the whole file at its exact version.
How to install
mdr add velimirmueller/lab-claude-skills/swift-testing@sha256:83ca5a9d4d2a6167The 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_dhpglzbvashvxiyr)
1 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 (9590 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_dhpglzbvashvxiyr GET https://markdownregistry.com/api/v1/resolve?ref=velimirmueller/lab-claude-skills/swift-testing GET https://markdownregistry.com/api/v1/blob/83ca5a9d4d2a6167301b4c31650c9c61fb79bde97841bd62f03fcf2f6485de99
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.
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