Can I use this for mocking API calls?

Absolutely. It provides specific patterns for module mocking, allowing you to intercept and mock libraries like Axios to return predictable data for your tests.

How does this help prevent flaky tests?

The skill emphasizes correct Mock Lifecycle management, such as clearing and restoring mocks between tests to ensure no state leaks from one test to another.

Does it include support for asynchronous testing?

Yes, it includes advanced patterns for mockImplementationOnce and fake timers, which are essential for testing promises and time-dependent functions.

Does this skill support both Jest and Vitest?

Yes, the patterns provided are designed to be compatible with both Jest and Vitest syntax, covering standard mocking APIs used in modern JS ecosystems.

Advanced JS Mocking Patterns

Name: Advanced JS Mocking Patterns
Author: Agentient

byAgentient

0•

Seguridad y Pruebas

Implements sophisticated JavaScript testing strategies for module isolation, timer manipulation, and mock lifecycle management.

This skill provides specialized guidance for mastering complex testing scenarios in JavaScript and TypeScript using frameworks like Jest and Vitest. It equips developers with the patterns necessary to mock entire modules, create partial spies for existing objects, and control time with fake timers for asynchronous logic. By enforcing best practices in mock lifecycle management and highlighting common anti-patterns, it ensures that unit and integration tests remain isolated, reliable, and maintainable across both frontend and backend environments.

Características Principales

01Precise control over asynchronous logic with fakeTimers and time advancement

02Detection and prevention of common mocking anti-patterns

03Advanced partial mocking and spy implementations using spyOn

04Standardized mock lifecycle management to prevent state leakage between tests

050 GitHub stars

06Automated module mocking for Jest and Vitest environments

Casos de Uso

01Isolating side effects in legacy code via strategic partial mocking

02Mocking external API clients like Axios or Fetch to isolate service logic

03Testing debounced or throttled functions by manipulating virtual time

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add agentient/vibekit advanced-js-mocking-patterns

For use in Claude.ai and ChatGPT

Características Principales

01Precise control over asynchronous logic with fakeTimers and time advancement

02Detection and prevention of common mocking anti-patterns

03Advanced partial mocking and spy implementations using spyOn

04Standardized mock lifecycle management to prevent state leakage between tests

050 GitHub stars

06Automated module mocking for Jest and Vitest environments

Casos de Uso

01Isolating side effects in legacy code via strategic partial mocking

02Mocking external API clients like Axios or Fetch to isolate service logic

03Testing debounced or throttled functions by manipulating virtual time

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add agentient/vibekit advanced-js-mocking-patterns

For use in Claude.ai and ChatGPT