Top TEST GitHub Repositories & Tools (2026)

Mobile app automation and verification for AI coding agents. CLI, MCP server, and typed Node.js API for iOS, Android, HarmonyOS, TV, web, macOS, and Linux.

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

JavaScript Testing utilities for React

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

Faker is a Python package that generates fake data for you.

Open-source platform for creating safe, isolated production sandboxes for API, integration, and E2E testing.

Simple JavaScript testing framework for browsers and node.js

Self-hosted Speed Test for HTML5 and more. Easy setup, examples, configurable, mobile friendly. Supports PHP, Node, Multiple servers, and more

Statsmodels: statistical modeling and econometrics in Python

Mockery is a simple yet flexible PHP mock object framework for use in unit testing with PHPUnit, PHPSpec or any other testing framework. Its core goal is to offer a test double framework with a succinct API capable of clearly defining all possible object operations and interactions using a human readable Domain Specific Language (DSL).

Foundry is a blazing fast, portable and modular toolkit for Ethereum application development written in Rust.

✅ The programmer-friendly testing framework for Java and the JVM

syzkaller is an unsupervised coverage-guided kernel fuzzer

:mailbox: SMTP Server + Web Interface for viewing and testing emails during development.

Quick and Easy server testing/validation

MockServer is an HTTP(S) mock server and proxy for testing that lets you mock APIs, inspect and modify live traffic, and inject failures. It supports HTTP/1.1, HTTP/2, gRPC, WebSockets, TCP and more on a single port, with additional support for HTTP/3, message brokers, and AI/LLM APIs.

Code coverage for Ruby with a powerful configuration library and automatic merging of coverage across test suites

Full-stack testing PHP framework

A library to support tests with throwaway instances of Docker containers for all compatible .NET Standard versions.

Test infrastructure for the Kubernetes project.