What types of mocking does this skill cover?

It covers function mocks, module mocks, class/constructor mocks, spying on methods, and mocking global objects like Fetch, Date, and Environment Variables.

Can I use this for TypeScript projects?

Yes, the skill provides specific patterns and type-casting examples (like jest.MockedClass) for using Jest mocks within TypeScript environments.

How does it handle partial module mocking?

It includes patterns for using jest.requireActual() to keep original implementations for some functions while mocking only specific exports within the same module.

Does it help with cleaning up tests?

Yes, it provides guidance on the differences between mockClear, mockReset, and mockRestore to ensure test independence and hygiene.

Jest Mocking Patterns

Name: Jest Mocking Patterns
Author: bradtaylorsf

bybradtaylorsf

•

Seguridad y Pruebas

Provides expert guidance and code patterns for implementing comprehensive mocking strategies in Jest-based testing environments.

The Jest Mocking skill equips Claude with deep knowledge of mocking techniques required for robust JavaScript and TypeScript testing. It covers everything from basic function and module mocks to complex scenarios like class constructors, spying on getters/setters, and mocking global objects like fetch or the system date. By providing standardized implementation patterns and best practices, this skill ensures that your tests remain isolated, deterministic, and maintainable across frontend and backend projects.

Características Principales

01Functional and module mocking patterns for complete test isolation

02Advanced spying strategies for monitoring method calls and getters/setters

03Patterns for mocking system globals including Dates, Environment Variables, and Fetch

04Class and constructor mocking techniques for object-oriented codebases

056 GitHub stars

06Comprehensive utilities for clearing, resetting, and restoring mocks

Casos de Uso

01Simulating edge cases and error states by manipulating mock return values

02Verifying internal component interactions and call signatures using Jest spies

03Isolating unit tests from external API dependencies using manual or factory mocks

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add bradtaylorsf/alphaagent-team jest-mocking

For use in Claude.ai and ChatGPT

Download Skill