Antipattern Prevention
doorkeeper-gem/doorkeeper
Avoid common Ruby and Rails antipatterns that degrade maintainability and performance.
Points at the testing guide, the reference that defines the vocabulary for talking about tests, classifies them on six dimensions, and says how to choose which kind to write, with sections mapping…
Install Testing Guide
$ npx skills add ruby-git/ruby-git --skill testing-guide -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install ruby-git/ruby-git testing-guide --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/ruby-git/ruby-git.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.github/skills/testing-guide .claude/skills/testing-guide && rm -rf skills-srcUse ~/.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/
Install the "testing-guide" agent skill from https://github.com/ruby-git/ruby-git/tree/main/.github/skills/testing-guide into .claude/skills/testing-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing-guide", 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 install https://github.com/ruby-git/ruby-git/tree/main/.github/skills/testing-guideType 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.
$ npx skills add ruby-git/ruby-git --skill testing-guide -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install ruby-git/ruby-git testing-guide --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ruby-git/ruby-git.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.github/skills/testing-guide .agents/skills/testing-guide && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "testing-guide" agent skill from https://github.com/ruby-git/ruby-git/tree/main/.github/skills/testing-guide into .agents/skills/testing-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing-guide", 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.
$ npx skills add ruby-git/ruby-git --skill testing-guide -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install ruby-git/ruby-git testing-guide --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ruby-git/ruby-git.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.github/skills/testing-guide .cursor/skills/testing-guide && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "testing-guide" agent skill from https://github.com/ruby-git/ruby-git/tree/main/.github/skills/testing-guide into .cursor/skills/testing-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing-guide", 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 https://github.com/ruby-git/ruby-git.git --path .github/skills/testing-guide--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add ruby-git/ruby-git --skill testing-guide -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install ruby-git/ruby-git testing-guide --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ruby-git/ruby-git.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.github/skills/testing-guide .gemini/skills/testing-guide && rm -rf skills-srcUse ~/.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/
Install the "testing-guide" agent skill from https://github.com/ruby-git/ruby-git/tree/main/.github/skills/testing-guide into .gemini/skills/testing-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing-guide", 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.
$ gh skill install ruby-git/ruby-git testing-guideInstalls 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).
$ npx skills add ruby-git/ruby-git --skill testing-guide -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/ruby-git/ruby-git.git skills-src && mkdir -p .github/skills && cp -r skills-src/.github/skills/testing-guide .github/skills/testing-guide && rm -rf skills-srcUse ~/.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/
Install the "testing-guide" agent skill from https://github.com/ruby-git/ruby-git/tree/main/.github/skills/testing-guide into .github/skills/testing-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing-guide", 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.
$ npx skills add ruby-git/ruby-git --skill testing-guide -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install ruby-git/ruby-git testing-guide --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ruby-git/ruby-git.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.github/skills/testing-guide .opencode/skills/testing-guide && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "testing-guide" agent skill from https://github.com/ruby-git/ruby-git/tree/main/.github/skills/testing-guide into .opencode/skills/testing-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing-guide", 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-guide- GitHub stars
- 1.8k
- Token cost
- ~1k tokens
- SKILL.md length
- 458 words
- Files
- 1
- Skills in repo
- 30
- Repo updated
- First seen
- Licence
- MIT
At a glance
Points at the testing guide, the reference that defines the vocabulary for talking about tests, classifies them on six dimensions, and says how to choose which kind to write, with sections mapping…
- Tasks that involve Backend development
- SKILL.md covers How to use this skill, Changes and additions for… and Related skills
- Calls claude
What it does
Testing Guide is an agent skill from ruby-git/ruby-git. Points at the testing guide, the reference that defines the vocabulary for talking about tests, classifies them on six dimensions, and says how to choose which kind to write, with sections mapping it to Ruby, RSpec, and Rails. Load only when asked why a testing rule exists, what a test term means, how to classify or name a test, or when writing or reviewing a testing skill or standard. Do not load it for ordinary test writing; the standards skills are self-sufficient for that.
Its SKILL.md is about 1k 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 Backend & APIs, covering Backend development. It works with Ruby. The repository describes itself as: Ruby/Git is a Ruby library that can be used to create, read and manipulate Git repositories by wrapping system calls to the git binary. The licence is MIT.
When your agent uses it
- Tasks that involve Backend development
Example prompts
- “Use the testing-guide skill to point at the testing guide, the reference that defines the vocabulary for talking about tests, classifies them on six…”
- “/testing-guide”
What it can do on your machine
Read from SKILL.md and the folder at commit f3bf20f. 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:
claude
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
github.com
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 Guide loads about 1k tokens when it runs. Until then it costs about 124 tokens; SKILL.md has 458 words of instructions outside code blocks.
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 ruby-git/ruby-git at commit f3bf20f, republished under its MIT licence (© ruby-git). 458 words, ~1,002 tokens.
Download SKILL.mdSave it as
.claude/skills/testing-guide/SKILL.md (or your agent's skills folder).- name
- testing-guide
- description
- Points at the testing guide, the reference that defines the vocabulary for talking about tests, classifies them on six dimensions, and says how to choose which kind to write, with sections mapping it to Ruby, RSpec, and Rails. Load only when asked why a testing rule exists, what a test term means, how to classify or name a test, or when writing or reviewing a testing skill or standard. Do not load it for ordinary test writing; the standards skills are self-sufficient for that.
Testing guide
The testing guide defines the vocabulary the testing skills in this repository are
written in and explains why their rules exist. The guide lives in the
jcouball-testing plugin, and the testing-guide skill there says when to read it
and which section answers which question. This file holds only what is specific to
ruby-git, so the guide has one copy and this project keeps only its differences.
How to use this skill
Invoke /jcouball-testing:testing-guide and apply the changes below throughout
its workflow. If you arrived here because that skill told you to read this file,
do not invoke it again — it is already in context; apply the changes below and
continue.
If the plugin is not installed, install it first:
claude plugin marketplace add jcouball/agent-plugins
claude plugin install jcouball-testing@jcouballIn an agent that cannot install or invoke Claude Code plugins, read the guide and the skill from the plugin source and apply the same changes on top. In Copilot Chat, attach this file and those two to your context and proceed the same way.
Changes and additions for ruby-git
- What derives from the guide. The guide is the source the
RSpec unit testing standards skill
derives its rules from. That skill states what a spec under
spec/unit/MUST and SHOULD do so that a reviewer can enforce it. The guide explains the terms those rules are written in and why the rules exist. When the two disagree, either the guide is wrong or the rule is out of date, and the fix is to change one of them, not to work around the gap. - When it runs. The default rake task runs the whole unit and integration suite on every change, so every test in the repository has that value on the when-it-runs dimension.
- Unit test school. The guide's default, solitary. The standards skill's stubbing rules assume it.
- Scope of the standards. The standards skill governs the unit tests under
spec/unit/. Several of its rules only hold at that scope. Onedescribeper class, a spec path that mirrors the source path, requiring only the file under test, stubbing non-trivial external objects, and strict determinism all break down once a test runs more than one real collaborator. The skill measures its 100% line and branch coverage gate over the unit suite alone. - Integration tests. They live under
spec/integration/and follow the Command test conventions and Facade test conventions. This project has no separate system test layer; the integration suite covers that ground. - Rails. The Rails spec types do not apply. This is not a Rails application.
Show full SKILL.md (40 more words)Show less
Related skills
- RSpec Unit Testing Standards — the
rules for
spec/unit/, derived from the guide - Command Test Conventions — conventions
for
Git::Commands::*unit and integration specs - Facade Test Conventions — conventions
for
Git::Repositorymodule specs - Test Debugging — diagnosing flaky, order-dependent, and failing tests
© ruby-git, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .github/skills/testing-guide of ruby-git/ruby-git.
Open the folder on GitHubat commit f3bf20f
Compare with similar skills
Testing Guide 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Testing Guide this skillruby-git/ruby-git | 1.8k | — | ~1k | Automated safety check: Pass | MIT | |
| Antipattern Preventiondoorkeeper-gem/doorkeeper | 5.5k | — | ~1.1k | Automated safety check: Pass | MIT | |
| Backfill Event Datarubyevents/rubyevents | 569 | — | ~2.8k | Automated safety check: Pass | None | |
| Ruby Version Managerst0012/ruby-skills | 125 | — | ~1.3k | Automated safety check: Pass | MIT | |
| Upgrade RailsRailsEventStore/ecommerce | 507 | — | ~976 | Automated safety check: Pass | MIT | |
| Rails ExpertJeffallan/claude-skills | 12k | — | ~1.4k | Automated safety check: Pass | MIT |
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Related
Works with
Categories
Questions about Testing Guide
What does Testing Guide do?
Points at the testing guide, the reference that defines the vocabulary for talking about tests, classifies them on six dimensions, and says how to choose which kind to write, with sections mapping…. Testing Guide is an agent skill from ruby-git/ruby-git. Points at the testing guide, the reference that defines the vocabulary for talking about tests, classifies them on six dimensions, and says how to choose which kind to write, with sections mapping it to Ruby, RSpec, and Rails.
When should I use Testing Guide?
Testing Guide fits situations like: tasks that involve Backend development.
How do I install Testing Guide in Claude Code?
Run `npx skills add ruby-git/ruby-git --skill testing-guide -a claude-code`. Or copy the skill folder (.github/skills/testing-guide in ruby-git/ruby-git) into .claude/skills/testing-guide in your project. Claude Code loads it when a task matches its description.
How do I install Testing Guide in Codex?
Run `npx skills add ruby-git/ruby-git --skill testing-guide -a codex`. Or copy the skill folder (.github/skills/testing-guide in ruby-git/ruby-git) into .agents/skills/testing-guide in your project. Codex loads it when a task matches its description.
Can I use Testing Guide 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 ruby-git/ruby-git --skill testing-guide -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-guide, .gemini/skills/testing-guide, .github/skills/testing-guide and .opencode/skills/testing-guide in your project.
What does Testing Guide need to run?
Going by SKILL.md and its folder, Testing Guide needs the command-line tools its instructions call (claude).
Does Testing Guide access the network?
SKILL.md names 1 domain. As links in the text: github.com. This is read from the text; nothing was executed.
Is Testing Guide 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 Guide use?
Testing Guide 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 Testing Guide use?
About 1k tokens (SKILL.md is roughly 4k 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 Guide?
Skills that share tags, products or a category with Testing Guide: Antipattern Prevention (doorkeeper-gem/doorkeeper, 5.5k stars), Backfill Event Data (rubyevents/rubyevents, 569 stars), Ruby Version Manager (st0012/ruby-skills, 125 stars) and Upgrade Rails (RailsEventStore/ecommerce, 507 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Testing Guide?
ruby-git (a GitHub organization) maintains it in ruby-git/ruby-git, which has 1,799 GitHub stars. The repository holds 30 skills in this directory. The repository was last updated on October 2, 2026.
Source: ruby-git/ruby-git on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.