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

0•

セキュリティとテスト

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

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.

主な機能

01Automated Jest configuration for JavaScript and TypeScript projects

02Advanced asynchronous testing and fake timer implementation

03Comprehensive reference for value, error, and mock assertions

040 GitHub stars

05Standardized test structuring using the Arrange-Act-Assert (AAA) pattern

06Code coverage reporting and threshold enforcement setup

ユースケース

01Refactoring legacy test suites into clean describe blocks with lifecycle hooks

02Debugging failing asynchronous tests or complex mock behavior

03Initializing 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

主な機能

01Automated Jest configuration for JavaScript and TypeScript projects

02Advanced asynchronous testing and fake timer implementation

03Comprehensive reference for value, error, and mock assertions

040 GitHub stars

05Standardized test structuring using the Arrange-Act-Assert (AAA) pattern

06Code coverage reporting and threshold enforcement setup

ユースケース

01Refactoring legacy test suites into clean describe blocks with lifecycle hooks

02Debugging failing asynchronous tests or complex mock behavior

03Initializing 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