StealIt
Seth HobsonClaude skill for testing

Javascript Testing Patterns

javascript-testing-patterns

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.

Install

Run this in your project folder. It works with Claude Code, Cursor, Codex and dozens of other agents.

$ npx skills add wshobson/agents --skill javascript-testing-patterns

Needs Node.js. Add -g to install for every project, or -a claude-code to skip the agent picker.

How to use Javascript Testing Patterns

Once it's installed, Claude reads this skill on its own whenever a request matches what it's for, so you don't have to mention it by name. In Claude Code you can also run it directly by typing /javascript-testing-patterns.

It contains no scripts, only instructions and reference files, so it can't run code on its own.

What the instructions cover

  1. 1When to Use This Skill
  2. 2Testing Frameworks
  3. 3Unit Testing Patterns
  4. 4Mocking Patterns
  5. 5Integration Testing
  6. 6Frontend Testing with Testing Library
  7. 7Test Fixtures and Factories
  8. 8Best Practices

Section headings from the skill's SKILL.md file.

What's inside · 2 files

  • SKILL.md
  • references/advanced-testing-patterns.md

More from Seth Hobson

See all →

Accessibility Compliance

Implement WCAG 2.2 compliant interfaces with mobile accessibility, inclusive design patterns, and assistive technology support. Use when auditing accessibility, implementing ARIA…

Design & UISeth Hobson42k

AI Debt Detector

Use after generating code, after accepting AI suggestions, or when reviewing AI-written modules. Also use when code works but feels brittle, when error handling seems thin, when…

AI & AgentsSeth Hobson42k

Airflow Dag Patterns

Build production Apache Airflow DAGs with best practices for operators, sensors, testing, and deployment. Use when creating data pipelines, orchestrating workflows, or scheduling…

Data & DatabasesSeth Hobson42k

Angular Migration

Migrate from AngularJS to Angular using hybrid mode, incremental component rewriting, and dependency injection updates. Use when upgrading AngularJS applications, planning…

FrontendSeth Hobson42k

More Claude skills for testing

See all →

Agent BrowserTop pick

Browser automation CLI for AI agents. Use when the user needs to interact with websites, including navigating pages, filling forms, clicking buttons, taking screenshots…

Testing & BrowserVercel46k

TDDTop pick

Test-driven development. Use when the user wants to build features or fix bugs test-first, mentions "red-green-refactor", or wants integration tests.

Testing & BrowserMatt Pocock313k

Test Driven Development

Use when implementing any feature or bugfix, before writing implementation code

Testing & BrowserJesse Vincent312k

Webapp Testing

Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots…

Testing & BrowserAnthropic187k