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Agent skill

Swift Testing

by HoangNguyen0403 in HoangNguyen0403/agent-skills-standard

Write XCTest cases, async tests, and organized test suites in Swift.

MITAuto-check passedMobile

Install Swift Testing

skills CLI
$ npx skills add HoangNguyen0403/agent-skills-standard --skill swift-testing -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install HoangNguyen0403/agent-skills-standard swift-testing --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/swift/swift-testing .claude/skills/swift-testing && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
swift-testing
GitHub stars
572
Token cost
~801 tokens
SKILL.md length
333 words
Files
3 (incl. references)
Skills in repo
211
Repo updated
First seen
Licence
MIT

At a glance

Write XCTest cases, async tests, and organized test suites in Swift.

  • Writing XCTest cases
  • SKILL.md covers Priority: P0 (CRITICAL), Core Rule Anchors, Write XCTest Cases and Test Async Code, plus 4 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Organizing test suites in Swift

What it does

Swift Testing is an agent skill from HoangNguyen0403/agent-skills-standard. Write XCTest cases, async tests, and organized test suites in Swift. Use when writing XCTest cases, async tests, or organizing test suites in Swift.

Its SKILL.md is about 800 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `evals/evals.json` and `references/implementation.md`).

It sits in Mobile, covering iOS development and Test generation. The repository describes itself as: A collection of Agent Skills Standard and Best Practice for Programming Languages, Frameworks that help our AI Agent follow best practies on frameworks and programming laguages. The licence is MIT.

When your agent uses it

  • Writing XCTest cases
  • Organizing test suites in Swift

Example prompts

  • “/swift-testing”

What it can do on your machine

Read from SKILL.md and the folder at commit b529c2d. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Swift Testing loads about 801 tokens when it runs, and up to ~1.4k if it reads all its reference files. Until then it costs about 41 tokens; SKILL.md has 333 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~41
When it runs · the whole SKILL.md, loaded when a task matches
~801
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from HoangNguyen0403/agent-skills-standard at commit b529c2d, republished under its MIT licence (© HoangNguyen0403). 333 words, ~801 tokens.

Download SKILL.mdSave it as .claude/skills/swift-testing/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.
name
swift-testing
description
Write XCTest cases, async tests, and organized test suites in Swift. Use when writing XCTest cases, async tests, or organizing test suites in Swift.

Swift Testing Standards

Priority: P0 (CRITICAL)

Core Rule Anchors

  • [MOB-TEST-01] Tripartite Naming: Test functions must follow test_method_scenario_expectedBehavior or testMethod_scenario_expectedBehavior.
  • [MOB-TEST-02] State Invariant Rule: Assert state transitions and invariants; ban trivial state mirror tests.
  • [MOB-TEST-03] Entity Invariant & Codable Rule: Test calculations, validations, domain invariants, and non-trivial Codable serialization/parsing or error mapping; ban testing trivial getters or echo tests.
  • [MOB-TEST-04] Contract Testing Rule: Repositories and data sources must be tested for contract compliance and error mapping; ban 1:1 pass-through mock echoing.
  • [MOB-TEST-05] Bug-First Regression Lock: Every PR fixing a bug ticket or with title fix(...) must introduce a test reproducing the defect prior to the fix.

Write XCTest Cases

  • Standard Naming: Test functions must prefixed by 'test' ([MOB-TEST-01], e.g., func test_userLogin_whenValid_isSuccessful()).
  • Setup/Teardown: Use setUpWithError() and tearDownWithError() for environment management.
  • Assertions: Use specific assertions: XCTAssertEqual, XCTAssertNil, XCTAssertTrue, etc.

See implementation examples for XCTest setup/teardown, async tests, and UI test patterns.

Test Async Code

  • Async/Await: Mark test methods as async throws and use try await directly inside them.
  • Expectations: Use XCTestExpectation for callback-based async logic. Call expectation then fulfill() when done; then wait(for: [exp], timeout: 2.0) to block.
  • Timeout: Always set reasonable timeouts for expectations to avoid hanging CI.

Organize Test Suites

  • Unit Tests: Use protocols for dependencies and inject them via constructor (e.g., init(service: ServiceProtocol)). Focus on logic isolation using mocks/stubs.
  • UI Tests: Test user flows using XCUIApplication and accessibility identifiers.
  • Coverage: Coverage is diagnostic and project-configured; verify risk-weighted critical paths rather than padding code for an arbitrary percentage.

Anti-Patterns

  • [MOB-TEST-01..05] Violations: Ban vague names, trivial state mirrors, echo tests, 1:1 mock echoing, and unverified bug fixes.
  • No Thread.sleep: Use expectations or await.
  • No force unwrap in tests: Use XCTUnwrap() for better failure messages.
  • No assertion-free tests: A test that only runs code without asserting contract invariants is not a test.

References

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

  • Inject them via constructor
  • Use protocols
  • prefixed by 'test'

© HoangNguyen0403, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files (references) in skills/swift/swift-testing of HoangNguyen0403/agent-skills-standard.

  • SKILL.md
  • evals/evals.json
  • references/implementation.md

Open the folder on GitHubat commit b529c2d

Compare with similar skills

Swift Testing next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Swift Testing compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Swift Testing this skillHoangNguyen0403/agent-skills-standard572—~801Automated safety check: PassMIT
Modernize TestsCamilleScholtz/swmpc2391 repos~2.4kAutomated safety check: PassEUPL-1.2
Swift Testingnimblehq/ios-templates110—~1.3kAutomated safety check: PassMIT
Swiftui Protwostraws/SwiftUI-Agent-Skill5.6k2 repos~1.5kAutomated safety check: PassMIT
Swiftui UI PatternsAFK-surf/OpenBridge4304 repos~887Automated safety check: PassMIT
Swiftui Performance Auditharperreed/dotfiles3348 repos~1.4kAutomated safety check: PassNone

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    Modernize test suites to use modern Swift Testing features or migrate from XCTest.

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Categories

Questions about Swift Testing

What does Swift Testing do?

Write XCTest cases, async tests, and organized test suites in Swift. Swift Testing is an agent skill from HoangNguyen0403/agent-skills-standard. Write XCTest cases, async tests, and organized test suites in Swift.

When should I use Swift Testing?

Swift Testing fits situations like: writing XCTest cases; organizing test suites in Swift.

How do I install Swift Testing in Claude Code?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill swift-testing -a claude-code`. Or copy the skill folder (skills/swift/swift-testing in HoangNguyen0403/agent-skills-standard) into .claude/skills/swift-testing in your project. Claude Code loads it when a task matches its description.

How do I install Swift Testing in Codex?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill swift-testing -a codex`. Or copy the skill folder (skills/swift/swift-testing in HoangNguyen0403/agent-skills-standard) into .agents/skills/swift-testing in your project. Codex loads it when a task matches its description.

Can I use Swift Testing in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add HoangNguyen0403/agent-skills-standard --skill swift-testing -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/swift-testing, .gemini/skills/swift-testing, .github/skills/swift-testing and .opencode/skills/swift-testing in your project.

What does Swift Testing need to run?

SKILL.md names no scripts, command-line tools or credentials: Swift Testing is instructions for the agent only.

Does Swift Testing access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Swift Testing safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Swift Testing use?

Swift Testing is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Swift Testing use?

About 801 tokens (SKILL.md is roughly 3.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 579 tokens, read only when the agent opens those files.

What are the alternatives to Swift Testing?

Skills that share tags, products or a category with Swift Testing: Modernize Tests (CamilleScholtz/swmpc, 239 stars), Swift Testing (nimblehq/ios-templates, 110 stars), Swiftui Pro (twostraws/SwiftUI-Agent-Skill, 5.6k stars) and Swiftui UI Patterns (AFK-surf/OpenBridge, 430 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Swift Testing?

HoangNguyen0403 (a GitHub user) maintains it in HoangNguyen0403/agent-skills-standard, which has 572 GitHub stars. The repository holds 211 skills in this directory. The repository was last updated on October 9, 2026.

Source: HoangNguyen0403/agent-skills-standard on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.