# JavaScript Testing Patterns (agent skill)

> JavaScript Testing Patterns is an agent skill (a SKILL.md file) from wshobson/agents. Implement comprehensive testing strategies using Jest, Vitest, and Testing Library for unit tests, integration tests, and end-to-end testing with mocking, fixtures, and test-driven… It works with Claude Code, Codex, Cursor, GitHub Copilot and OpenCode and has 41,725 GitHub stars across a repository of 7 listed skills.

Implement comprehensive testing strategies using Jest, Vitest, and Testing Library for unit tests, integration tests, and end-to-end testing with mocking, fixtures, and test-driven development. Use when writing JavaScript/TypeScript tests, setting up test infrastructure, or implementing TDD/BDD workflows. Comprehensive guide for implementing robust testing strategies in JavaScript/TypeScript applications using modern testing frameworks and best practices.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/wshobson/agents |
| Skill path | plugins/javascript-typescript/skills/javascript-testing-patterns/SKILL.md |
| Skill name | javascript-testing-patterns |
| GitHub stars | 41,725 |
| Installs on skills.sh | 2 |
| License | MIT |
| Skills in repo | 7 |
| Plugin marketplace | claude-code-workflows |
| Official | no |
| Works with | Claude Code, Codex, Cursor, GitHub Copilot, OpenCode |
| Category | Testing & QA |
| Last commit | Oct 17, 2026 |

## When it triggers

- Use when writing JavaScript/TypeScript tests, setting up test infrastructure, or implementing TDD/BDD workflows.

## Add this skill

### Claude Code

```sh
/plugin marketplace add wshobson/agents
/plugin install javascript-typescript@claude-code-workflows
```

In the Claude apps, zip the skill folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

### ChatGPT / Codex

```sh
git clone --depth 1 https://github.com/wshobson/agents.git
cp -r agents/plugins/javascript-typescript/skills/javascript-testing-patterns .agents/skills/javascript-testing-patterns   # repo; ~/.agents/skills for all projects
```

### Cursor

```sh
git clone --depth 1 https://github.com/wshobson/agents.git
cp -r agents/plugins/javascript-typescript/skills/javascript-testing-patterns .cursor/skills/javascript-testing-patterns   # project; ~/.cursor/skills for all projects
```

Sources (checked 2026-10-07): https://code.claude.com/docs/en/skills, https://support.claude.com/en/articles/12512180-using-skills-in-claude, https://learn.chatgpt.com/docs/build-skills, https://cursor.com/docs/context/skills

skills.sh listing: https://www.skills.sh/wshobson/agents/javascript-testing-patterns

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