How do I check code coverage with this skill?

The skill provides ready-to-use CLI commands and configuration snippets to generate coverage reports and set minimum global thresholds for branches and lines.

Can it help with mocking functions and modules?

Absolutely. It provides detailed patterns for mock assertions, spy functions, and resetting mocks between tests using clearMocks and restoreMocks.

Does this skill support TypeScript projects?

Yes, it includes specific configurations for ts-jest and tsconfig.json to ensure seamless TypeScript integration and type-safe testing.

Does it support testing asynchronous code?

Yes, it covers testing Promises, async/await patterns, and specialized tools for advancing or running pending timers.

Jest Testing Fundamentals

Name: Jest Testing Fundamentals
Author: karchtho

bykarchtho

Security & Testing

Configures and optimizes Jest testing environments for JavaScript and TypeScript projects with standardized patterns.

About

This skill provides comprehensive guidance for setting up, structuring, and running Jest tests in modern web development environments. It assists developers in creating robust configuration files, implementing the Arrange-Act-Assert (AAA) pattern, managing complex test lifecycles with hooks, and enforcing high code quality through coverage thresholds. Whether you are debugging asynchronous tests or setting up sophisticated mock assertions, this skill ensures your testing suite is efficient, readable, and maintainable.

Key Features

Automated Jest configuration for JavaScript and TypeScript projects
Advanced asynchronous testing and fake timer implementation
Comprehensive reference for value, error, and mock assertions
0 GitHub stars
Standardized test structuring using the Arrange-Act-Assert (AAA) pattern
Code coverage reporting and threshold enforcement setup

Use Cases

Refactoring legacy test suites into clean describe blocks with lifecycle hooks
Debugging failing asynchronous tests or complex mock behavior
Initializing a new TypeScript project with a pre-configured Jest environment

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add karchtho/my-claude-marketplace jest-fundamentals

For use in Claude.ai and ChatGPT

Download Skill

GitHub