React Testing
affaan-m/ECC
React component testing with React Testing Library, Vitest/Jest, MSW for network mocking, accessibility assertions with axe, and the decision boundary between component tests and Playwright/Cypress…
Automatically activated when user works with Jest tests, mentions Jest configuration, asks about Jest matchers/mocks, or has files matching .test.js, .test.ts, jest.config..
Install Jest Testing
$ npx skills add aiskillstore/marketplace --skill jest-testing -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install aiskillstore/marketplace jest-testing --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/aiskillstore/marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/c0ntr0lledcha0s/jest-testing .claude/skills/jest-testing && 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 "jest-testing" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/c0ntr0lledcha0s/jest-testing into .claude/skills/jest-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "jest-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 install https://github.com/aiskillstore/marketplace/tree/main/skills/c0ntr0lledcha0s/jest-testingType 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 aiskillstore/marketplace --skill jest-testing -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install aiskillstore/marketplace jest-testing --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/c0ntr0lledcha0s/jest-testing .agents/skills/jest-testing && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "jest-testing" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/c0ntr0lledcha0s/jest-testing into .agents/skills/jest-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "jest-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.
$ npx skills add aiskillstore/marketplace --skill jest-testing -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install aiskillstore/marketplace jest-testing --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/c0ntr0lledcha0s/jest-testing .cursor/skills/jest-testing && 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 "jest-testing" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/c0ntr0lledcha0s/jest-testing into .cursor/skills/jest-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "jest-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 https://github.com/aiskillstore/marketplace.git --path skills/c0ntr0lledcha0s/jest-testing--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 aiskillstore/marketplace --skill jest-testing -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install aiskillstore/marketplace jest-testing --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/c0ntr0lledcha0s/jest-testing .gemini/skills/jest-testing && 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 "jest-testing" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/c0ntr0lledcha0s/jest-testing into .gemini/skills/jest-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "jest-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.
$ gh skill install aiskillstore/marketplace jest-testingInstalls 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 aiskillstore/marketplace --skill jest-testing -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/c0ntr0lledcha0s/jest-testing .github/skills/jest-testing && 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 "jest-testing" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/c0ntr0lledcha0s/jest-testing into .github/skills/jest-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "jest-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.
$ npx skills add aiskillstore/marketplace --skill jest-testing -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install aiskillstore/marketplace jest-testing --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/c0ntr0lledcha0s/jest-testing .opencode/skills/jest-testing && 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 "jest-testing" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/c0ntr0lledcha0s/jest-testing into .opencode/skills/jest-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "jest-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
jest-testing- GitHub stars
- 430
- Token cost
- ~4.1k tokens
- SKILL.md length
- 558 words
- Files
- 5 (incl. scripts, references, assets)
- Skills in repo
- 1,108
- Repo updated
- First seen
- Licence
- None found
At a glance
Automatically activated when user works with Jest tests, mentions Jest configuration, asks about Jest matchers/mocks, or has files matching .test.js, .test.ts, jest.config..
- Works in 7 steps: Jest Configuration: Setup, configuration… → Matchers & Assertions: Built-in and… → Mocking: Mock functions, modules,… → …
- Works with Jest tests
- SKILL.md covers Your Capabilities, When to Use This Skill, How to Use This Skill and Available Resources, plus 6 more sections
- Runs TypeScript and Shell scripts from its folder; calls jest
What it does
Jest Testing is an agent skill from aiskillstore/marketplace. Automatically activated when user works with Jest tests, mentions Jest configuration, asks about Jest matchers/mocks, or has files matching .test.js, .test.ts, jest.config.. Provides Jest-specific expertise for testing React, Node.js, and JavaScript applications. Also applies to Vitest due to API compatibility. Does NOT handle general quality analysis - use analyzing-test-quality for that.
Its SKILL.md is about 4.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files, including scripts, reference files and assets (for example `assets/test-file.template.ts`, `references/jest-cheatsheet.md` and `scripts/check-jest-setup.sh`).
It sits in Testing & QA, covering Unit testing. It works with Jest, React, JavaScript and Node.js. The repository describes itself as: Security-audited skills for Claude, Codex & Claude Code. One-click install, quality verified.
When your agent uses it
- Works with Jest tests
- Mentions Jest configuration
- Asks about Jest matchers/mocks
- Has files matching .test.js
Example prompts
- “/jest-testing”
Requirements
- Node.js
- A Bash shell
- Pre-approved tools (allowed-tools): Read, Grep, Glob, Bash
Workflow steps
7 steps, taken from the first numbered list in SKILL.md.
- Jest Configuration: Setup, configuration files, environments, and presets
- Matchers & Assertions: Built-in and custom matchers, asymmetric matchers
- Mocking: Mock functions, modules, timers, and external dependencies
- Snapshot Testing: Inline and external snapshots, snapshot updates
- Code Coverage: Coverage configuration, thresholds, and reports
- Test Organization: Describe blocks, hooks, test filtering
- React Testing: Testing React components with Jest DOM and RTL
What it can do on your machine
Read from SKILL.md and the folder at commit ad8daf7. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
ReadGrepGlobBash
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 1 file in scripts/ (TypeScript and Shell), which the agent can run.
Shell commands in SKILL.md call:
jest
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
Jest Testing loads about 4.1k tokens when it runs, and up to ~5.7k if it reads all its reference files. Until then it costs about 102 tokens; SKILL.md has 558 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: notes
The automated check noted patterns worth knowing about, such as sudo or a known installer.
- NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
allowed-tools: Read, Grep, Glob, Bash
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); the scripts in this folder are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 558 words (~4,094 tokens).
“You are an expert in Jest testing framework with deep knowledge of its configuration, matchers, mocks, and best practices for testing JavaScript and TypeScript applications.”
- name
- jest-testing
- allowed-tools
- Read, Grep, Glob, Bash
- version
- 1.1.0
- capabilities
- jest-configuration, matchers-assertions, mocking-strategies, snapshot-testing, code-coverage, react-testing-library, async-testing, custom-matchers…
Files
SKILL.md and 4 other files (scripts, references, assets) in skills/c0ntr0lledcha0s/jest-testing of aiskillstore/marketplace.
- SKILL.md
- assets/test-file.template.ts
- references/jest-cheatsheet.md
- scripts/check-jest-setup.sh
- skill-report.json
Open the folder on GitHubat commit ad8daf7
Compare with similar skills
Jest 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Jest Testing this skillaiskillstore/marketplace | 430 | — | ~4.1k | Automated safety check: Notes | None | |
| React Testingaffaan-m/ECC | 275k | 1 repos | ~3.3k | Automated safety check: Pass | MIT | |
| Vitest Skillsickn33/agentic-awesome-skills | 47k | 1 repos | ~1.2k | Automated safety check: Pass | MIT | |
| Vitestjezweb/claude-skills | 1.1k | — | ~3k | Automated safety check: Pass | MIT | |
| Reactpedronauck/skills | 634 | 1 repos | ~1.5k | Automated safety check: Pass | None | |
| Cometchat React V7 Testingcometchat/cometchat-skills | 130 | — | ~1.1k | Automated safety check: Pass | MIT |
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Related
Works with
Categories
Questions about Jest Testing
What does Jest Testing do?
Automatically activated when user works with Jest tests, mentions Jest configuration, asks about Jest matchers/mocks, or has files matching .test.js, .test.ts, jest.config.. Jest Testing is an agent skill from aiskillstore/marketplace.config..
When should I use Jest Testing?
Jest Testing fits situations like: works with Jest tests; mentions Jest configuration; asks about Jest matchers/mocks; has files matching .test.js.
How do I install Jest Testing in Claude Code?
Run `npx skills add aiskillstore/marketplace --skill jest-testing -a claude-code`. Or copy the skill folder (skills/c0ntr0lledcha0s/jest-testing in aiskillstore/marketplace) into .claude/skills/jest-testing in your project. Claude Code loads it when a task matches its description.
How do I install Jest Testing in Codex?
Run `npx skills add aiskillstore/marketplace --skill jest-testing -a codex`. Or copy the skill folder (skills/c0ntr0lledcha0s/jest-testing in aiskillstore/marketplace) into .agents/skills/jest-testing in your project. Codex loads it when a task matches its description.
Can I use Jest 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 aiskillstore/marketplace --skill jest-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/jest-testing, .gemini/skills/jest-testing, .github/skills/jest-testing and .opencode/skills/jest-testing in your project.
What does Jest Testing need to run?
Going by SKILL.md and its folder, Jest Testing needs TypeScript and a shell for the scripts in its folder and the command-line tools its instructions call (jest). Our summary lists: Node.js; A Bash shell. Its frontmatter pre-approves these tools: Read, Grep, Glob, Bash.
Does Jest 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 Jest Testing safe to install?
Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Jest Testing use?
No licence was found for Jest Testing or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Jest Testing use?
About 4.1k tokens (SKILL.md is roughly 16k 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 1.6k tokens, read only when the agent opens those files.
What are the alternatives to Jest Testing?
Skills that share tags, products or a category with Jest Testing: React Testing (affaan-m/ECC, 275k stars), Vitest Skill (sickn33/agentic-awesome-skills, 47k stars), Vitest (jezweb/claude-skills, 1.1k stars) and React (pedronauck/skills, 634 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Jest Testing?
aiskillstore (a GitHub organization) maintains it in aiskillstore/marketplace, which has 430 GitHub stars. The repository holds 1,108 skills in this directory. The repository was last updated on October 7, 2026.
Source: aiskillstore/marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.