Top TESTING GitHub Repositories & Tools (2026)

PHP Mutation Testing library

Radio frequency scanner with recon and offensive capabilities

Open-source quantitative decision lab: test market assumptions, preserve negative results, and reproduce evidence.

Create React App Vite ⚛️

Open-source adversarial testing engine, SDK, and CLI for AI agents. Runs locally or against the Humanbound Platform.

Metis is a coding agent that boosts AI/LLM coding performance by 50%

Test Management Tool

A code coverage tool to generate native V8 reports or Istanbul reports.

Percy's Storybook SDK.

Lightweight tools for load testing web applications, written in C#

Installer for DataKitchen's Open Source Data Observability Products. Data breaks. Servers break. Your toolchain breaks. Ensure your team is the first to know and the first to solve with visibility across and down your data estate. Save time with simple, fast data quality test generation and execution. Trust your data, tools, and systems end to end.

Scalable Nx monorepo starter for Angular and NestJS apps with Firebase, Electron, Capacitor, GraphQL, testing, and CI automation.

MCP server for computer use & browser automation - screenshot, OCR, click, type, find_text, Chrome/Electron CDP, template matching. macOS, Windows & Android. Works with Claude, Cursor, and any MCP client.

Benchmarking and monitoring automation, designed for cloud, built with .NET.

Approval Tests implementation in NodeJS

Interactive screenshot tests for Compose UI

Open-source OpenAPI mock server with cloud hosting and local modes for development, testing, and CI. Generates realistic API responses from specs with latency simulation, error injection, proxy fallback, and request validation. Validated against 2,200+ real-world OpenAPI specs.

Laravel Dusk Testing Helper for Package Development

🐛 Advanced web vulnerability scanner with 5-rule false-positive reduction, WAF evasion, and modern HTML reports

Verifiable multi-agent patch evaluation infrastructure