Top TESTING GitHub Repositories & Tools (2026)

PHP Mutation Testing library

GO Feature Flag is a simple, complete and lightweight self-hosted cloud native feature flag solution 100% Open Source — built on OpenFeature 🎛️

The open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀

Documenting my security research journey: This repository contains detailed vulnerability write-ups, proof-of-concept (PoC) exploits, and the custom automation tools I use for reconnaissance and system assessment.

Laravel Dusk provides simple end-to-end testing and browser automation.

Asyncio support for pytest

Free, open source mental health communication web app to share experiences with loved ones

The Testing Framework

Next-gen phpDoc parser with support for intersection types and generics

MCP server for controlling a real iPhone via macOS iPhone Mirroring...and any MacOs app. Screenshot, tap, swipe, type — from any MCP client.

🔪Swiss-army knife for Android testing and development 🔪 ⛺

Stock Indicators for .NET is a C# NuGet package that transforms raw equity, commodity, forex, or cryptocurrency financial market price quotes into technical indicators and trading insights. You'll need this essential data in the investment tools that you're building for algorithmic trading, technical analysis, machine learning, or visual charting.

A library that creates fully populated objects for your unit tests.

🎬 The source for www.pointfree.co, a hub for advanced Swift programming.

AI-powered penetration testing assistant for automating recon, note-taking, and vulnerability analysis.

This repository holds the source code of Microsoft.Testing.Platform (MTP), a lightweight alternative to VSTest, as well as MSTest adapter and framework.

:key: Hash type identifier (CLI & lib)

Visual Studio Test Platform is the runner and engine that powers test explorer and vstest.console.

Rack::Test is a small, simple testing API for Rack apps.

Machine.Specifications is a Context/Specification framework for .NET that removes language noise and simplifies tests.