Agent skill

Testing

Testing patterns for behavior-driven tests. An agent skill from citypaul/.dotfiles.

Custom licenceAuto-check passedTesting & QA

Install Testing

skills CLI

$ npx skills add citypaul/.dotfiles --skill testing -a claude-code

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

GitHub CLI

$ gh skill install citypaul/.dotfiles 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/citypaul/.dotfiles.git skills-src && mkdir -p .claude/skills && cp -r skills-src/claude/.claude/skills/testing .claude/skills/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/

Paste into Claude Code

Install the "testing" agent skill from https://github.com/citypaul/.dotfiles/tree/main/claude/.claude/skills/testing into .claude/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/citypaul/.dotfiles/tree/main/claude/.claude/skills/testing

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add citypaul/.dotfiles --skill testing -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install citypaul/.dotfiles testing --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/citypaul/.dotfiles.git skills-src && mkdir -p .agents/skills && cp -r skills-src/claude/.claude/skills/testing .agents/skills/testing && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "testing" agent skill from https://github.com/citypaul/.dotfiles/tree/main/claude/.claude/skills/testing into .agents/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add citypaul/.dotfiles --skill testing -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install citypaul/.dotfiles testing --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/citypaul/.dotfiles.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/claude/.claude/skills/testing .cursor/skills/testing && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "testing" agent skill from https://github.com/citypaul/.dotfiles/tree/main/claude/.claude/skills/testing into .cursor/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/citypaul/.dotfiles.git --path claude/.claude/skills/testing

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add citypaul/.dotfiles --skill testing -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install citypaul/.dotfiles testing --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/citypaul/.dotfiles.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/claude/.claude/skills/testing .gemini/skills/testing && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "testing" agent skill from https://github.com/citypaul/.dotfiles/tree/main/claude/.claude/skills/testing into .gemini/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install citypaul/.dotfiles testing

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add citypaul/.dotfiles --skill testing -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/citypaul/.dotfiles.git skills-src && mkdir -p .github/skills && cp -r skills-src/claude/.claude/skills/testing .github/skills/testing && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "testing" agent skill from https://github.com/citypaul/.dotfiles/tree/main/claude/.claude/skills/testing into .github/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add citypaul/.dotfiles --skill testing -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install citypaul/.dotfiles testing --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/citypaul/.dotfiles.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/claude/.claude/skills/testing .opencode/skills/testing && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "testing" agent skill from https://github.com/citypaul/.dotfiles/tree/main/claude/.claude/skills/testing into .opencode/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: testing
GitHub stars: 739
Token cost: ~6.4k tokens
SKILL.md length: 2,245 words
Files: 1
Skills in repo: 44
Repo updated: Oct 2, 2026
First seen: Oct 7, 2026
Licence: Custom licence

At a glance

Testing patterns for behavior-driven tests. An agent skill from citypaul/.dotfiles.

Works in 5 steps: Tested repository-owned watch/affected… → Native VCS-aware selection when the… → Native dependency-aware selection from a… → …
Creating test factories
SKILL.md covers Core Principle, Fast, Relevant Test Execution, Mutation-Aware Test Planning and Test Through the Subject's…, plus 6 more sections
Calls vitest, jest and pytest

What it does

Testing is an agent skill from citypaul/.dotfiles. Testing patterns for behavior-driven tests. Use when writing tests, creating test factories, structuring test files, or deciding what to test. Do NOT use for UI-specific testing (see front-end-testing or react-testing skills).

Its SKILL.md is about 6.4k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Testing & QA, covering Test strategy. It works with React and Vitest.

When your agent uses it

Creating test factories
Structuring test files
Deciding what to test
UI-specific testing (see front-end-testing

Example prompts

“/testing”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

Tested repository-owned watch/affected command.
Native VCS-aware selection when the installed runner and repository configuration have proven its watch behavior.
Native dependency-aware selection from a complete, mechanically derived changed-source list.
Runner/orchestrator-selected affected packages/projects, including transitive dependents.
Exact test file/name only for proving RED or debugging, followed by one of the broader affected scopes for GREEN.

What it can do on your machine

Read from SKILL.md and the folder at commit cd4028d. 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
Shell commands in SKILL.md call:
- vitest
- jest
- pytest
- playwright
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

Testing loads about 6.4k tokens when it runs. Until then it costs about 59 tokens; SKILL.md has 2,245 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~59
When it runs · the whole SKILL.md, loaded when a task matches: ~6.4k

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

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 2,245 words (~6,399 tokens).

“For verifying test effectiveness through mutation analysis, load the mutation-testing skill. Use its mutator rules while planning and writing tests, but defer the automated mutation harness until the end-of-phase PR-readiness gate. For evaluating test quality against Dave Farley's properties, load…”

— opening of SKILL.md by citypaul, Custom licence

name: testing

Outline of SKILL.md

Testing Patterns
Core Principle
Fast, Relevant Test Execution
Mutation-Aware Test Planning
Test Through the Subject's Public Interface
Examples
Reach Code Through Behavior
Do Not Extract Merely To Mirror Tests
Test Factory Pattern
Core Principles
Basic Pattern
Complete Factory Example
Factory Composition
Anti-Patterns
Coverage Theater Detection
Pattern 1: Mock the function being tested
Pattern 2: Test only that function was called
Pattern 3: Test trivial getters/setters
Pattern 4: 100% line coverage, 0% branch coverage
No Automatic 1:1 Mapping Between Tests and Implementation
Summary Checklist

Read the full SKILL.md on GitHub

Files

Just SKILL.md in claude/.claude/skills/testing of citypaul/.dotfiles.

Open the folder on GitHubat commit cd4028d

Compare with similar skills

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.

Testing compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Testing this skillcitypaul/.dotfiles	739	—	~6.4k	Automated safety check: Pass	Custom licence	5 days ago
Senior QAnicepkg/auto-company	192	3 repos	~1.1k	Automated safety check: Notes	None	7 mo ago
Designing TestsCloudAI-X/claude-workflow-v2	1.4k	1 repos	~1.5k	Automated safety check: Pass	MIT	yesterday
Agent Harness Testing Methodologyhuiliyi37/Tianshu-harness	1.1k	—	~1k	Automated safety check: Notes	Apache-2.0	2 days ago
Effect TStellahq/opensession	392	—	~3.7k	Automated safety check: Pass	MIT	today
Javascript Testing Expertsoftmaple/softmaple	159	1 repos	~4k	Automated safety check: Pass	Apache-2.0	today

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Structure Codebase
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Works with

Questions about Testing

What does Testing do?

Testing patterns for behavior-driven tests. An agent skill from citypaul/.dotfiles. dotfiles. Testing patterns for behavior-driven tests.

When should I use Testing?

Testing fits situations like: creating test factories; structuring test files; deciding what to test; UI-specific testing (see front-end-testing.

How do I install Testing in Claude Code?

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

How do I install Testing in Codex?

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

Can I use 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 citypaul/.dotfiles --skill 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/testing, .gemini/skills/testing, .github/skills/testing and .opencode/skills/testing in your project.

What does Testing need to run?

Going by SKILL.md and its folder, Testing needs the command-line tools its instructions call (vitest, jest, pytest and playwright).

Does 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 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 Testing use?

Testing has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Testing use?

About 6.4k tokens (SKILL.md is roughly 26k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Testing?

Skills that share tags, products or a category with Testing: Senior QA (nicepkg/auto-company, 192 stars), Designing Tests (CloudAI-X/claude-workflow-v2, 1.4k stars), Agent Harness Testing Methodology (huiliyi37/Tianshu-harness, 1.1k stars) and Effect TS (tellahq/opensession, 392 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Testing?

citypaul (a GitHub user) maintains it in citypaul/.dotfiles, which has 739 GitHub stars. The repository holds 44 skills in this directory. The repository was last updated on October 2, 2026.

Source: citypaul/.dotfiles on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Testing

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

More from citypaul/.dotfiles

Related

Questions about Testing