Testing & Mocking Packages
Testing frameworks, assertion libraries, and mocking tools for writing reliable unit, integration, and end-to-end tests (testify, pytest, Vitest).
Packages in Testing & Mocking
Vitest
A blazing-fast unit testing framework powered by Vite, with Jest-compatible APIs out of the box.
Playwright
Cross-browser end-to-end web testing and browser automation with a single API for Chromium, Firefox, and WebKit.
jsdom
A pure-JavaScript implementation of the WHATWG DOM and HTML standards for Node.js.
React Testing Library
Simple and complete React DOM testing utilities that encourage good testing practices.
jest-dom
Custom Jest matchers for asserting on the state of the DOM in your tests.
jest
Delightful JavaScript testing with zero-config setup, snapshots, mocking, and coverage
user-event
Simulates the full sequence of real browser events so Testing Library tests behave the way an actual user does.
testify
The essential Go toolkit for assertions, mocks, and structured test suites.
pytest
The Python testing framework that makes writing small tests easy and scales to complex functional test suites.
DOM Testing Library
Simple, framework-agnostic DOM query utilities that test your UI the way real users interact with it.
Storybook
The industry-standard workshop for building, documenting, and testing UI components in isolation, across every major frontend framework.
Faker
Generate massive amounts of realistic fake data for testing, seeding, and mocking in JavaScript and TypeScript.
tempfile
A secure, cross-platform Rust library for temporary files and directories that clean up automatically on drop.
MSW (Mock Service Worker)
Seamless REST and GraphQL API mocking for browser and Node.js
pytest-asyncio
The pytest plugin that lets you write and run async/await test functions and fixtures directly.
