Testing GitHub Repositories (2026) · Open Source Tools

🐐 Simple and complete React DOM testing utilities that encourage good testing practices.

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

The open source visual testing platform for teams and AI agents. Review the product, not just the code.

Hurl, run and test HTTP requests with plain text.

Quick and Easy server testing/validation

The JavaScript testing framework powered by Rspack

The first open-source AI-driven tool for automatically generating system-level test cases (also known as fuzzing) for web/enterprise applications. Currently targeting whitebox and blackbox testing of Web APIs, like REST, GraphQL and RPC (e.g., gRPC and Thrift).

Supercharged End 2 End Testing Framework for NodeJS

Generating fake data for the JVM (Java, Kotlin, Groovy) has never been easier!

Taikai is an extension of the popular ArchUnit library, offering a comprehensive suite of predefined rules and checks tailored for various technologies.

Test your code in a real FreeBSD virtual machine on GitHub Actions -- QEMU-powered, with SSH and two-way folder sync

Awaitility is a small Java DSL for synchronizing asynchronous operations

Easy regression testing for iOS accessibility

MockBukkit is a mocking framework for Bukkit/PaperMC to allow the easy unit testing of Bukkit plugins.

C++20 μ(micro)/Unit Testing framework

AgentEval is the comprehensive .NET toolkit for AI agent evaluation—tool usage validation, RAG quality metrics, stochastic evaluation, and model comparison—built first for Microsoft Agent Framework (MAF) and Microsoft.Extensions.AI. What RAGAS, PromptFoo and DeepEval do for Python, AgentEval does for .NET

Web Application Firewall Testing Framework - Go version

A modern, expressive testing package for Swift

Random testing library for C#

Fast, native API client for REST, gRPC, WebSocket and GraphQL. A local-first Postman alternative written in Go: no Electron, no account, no cloud.