testing-patterns

Generate factory functions and mocking strategies for JavaScript unit tests.

Updated Mar 2, 2026
One-click install
npx skills add https://github.com/vitoropereira/claude-starter-kit --skill testing-patterns-vitoropereira
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: testing-patterns
Source: https://github.com/vitoropereira/claude-starter-kit/tree/main/.claude/skills/quality/testing-patterns
Command: npx skills add https://github.com/vitoropereira/claude-starter-kit --skill testing-patterns-vitoropereira

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill provides a comprehensive guide to writing effective unit tests, implementing TDD, and utilizing common testing utilities to improve code quality and maintainability.

Core Features & Use Cases

  • TDD Workflow: Learn the red-green-refactor cycle for test-driven development.
  • Factory Functions: Create reusable factory functions for test data and component props to keep tests DRY.
  • Mocking Strategies: Understand how to mock modules and specific functions, including GraphQL hooks.
  • Use Case: When developing a new React Native component, use this Skill's guidance to set up a custom render function with theme providers and create factory functions for component props to ensure robust and maintainable tests.

Quick Start

Use the testing-patterns skill to generate a factory function for mock user data.

Frequently Asked Questions about testing-patterns

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I write effective unit tests using TDD in JavaScript?

You can write effective unit tests using TDD by following the red-green-refactor cycle, creating factory functions for test data, and applying mocking strategies to ensure maintainable and DRY test suites.

What is the best way to generate mock data for Jest tests?

The best way to generate mock data for Jest tests is using factory functions, which create reusable test data structures to keep your test suites DRY and maintainable across multiple test cases.

How do I mock modules and asynchronous operations in TypeScript?

Mocking modules and asynchronous operations in TypeScript involves utilizing specific mocking strategies to replace module dependencies and async behaviors, ensuring isolated and reliable unit test execution.

Does this testing approach work for React Native components?

Yes, this testing approach works for React Native components by setting up custom render functions with theme providers and creating factory functions for component props to ensure robust tests.

How do I mock GraphQL hooks when testing React components?

You can mock GraphQL hooks when testing React components by applying targeted mocking strategies that replace hook dependencies, allowing isolated component rendering and behavior validation without network calls.

When should I use the factory pattern for test data generation?

You should use the factory pattern for test data generation when you need reusable, customizable test data structures across multiple tests, keeping your test suites DRY and preventing brittle test setup.