Best Open Source test Libraries

A curated list of the most popular GitHub repositories tagged with test. Select any project to visualize its architecture and dive into the codebase using RepoMind's AI engine.

#1microsoft/playwright

Playwright is a framework for Web Testing and Automation. It allows testing Chromium, Firefox and WebKit with a single API.

82,870TypeScript

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#2typicode/json-server

Get a full fake REST API with zero coding in less than 30 seconds (seriously)

75,642JavaScript

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#3bazelbuild/bazel

a fast, scalable, multi-language and extensible build system

25,150Java

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#4goldbergyoni/javascript-testing-best-practices

📗🌐 🚢 Comprehensive and exhaustive JavaScript & Node.js testing best practices (August 2025)

24,589JavaScript

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#5mochajs/mocha

☕️ Classic, reliable, trusted test framework for Node.js and the browser

22,873JavaScript

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#6enzymejs/enzyme

JavaScript Testing utilities for React

19,891JavaScript

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#7pytest-dev/pytest

The pytest framework makes it easy to write small tests, yet scales to support complex functional testing

13,648Python

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#8DevExpress/testcafe

A Node.js tool to automate end-to-end web testing.

9,904JavaScript

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#9webdriverio/webdriverio

Next-gen browser and mobile automation test framework for Node.js

9,723TypeScript

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#10olistic/warriorjs

🏰 An exciting game of programming and Artificial Intelligence

9,505JavaScript

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#11apache/jmeter

Apache JMeter open-source load testing tool for analyzing and measuring the performance of a variety of services

9,231Java

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#12marmelab/gremlins.js

Monkey testing library for web apps and Node.js

9,081JavaScript

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#13onsi/ginkgo

A Modern Testing Framework for Go

8,951Go

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#14angular/protractor

E2E test framework for Angular apps

8,694JavaScript

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