Testing

Windows GUI Automation with Python (based on text properties)

Test suites for Web platform specs — including WHATWG, W3C, and others

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

Quick and Easy server testing/validation

A payment application to demonstrate real-world usage of Cypress testing methods, patterns, and workflows.

mocking library for Kotlin

QA via natural language AI tests

Qodo-Cover: An AI-Powered Tool for Automated Test Generation and Code Coverage Enhancement! 💻🤖🧪🐞

Bash Infinity is a modern standard library / framework / boilerplate for Bash

A client-side server to build, test and share your JavaScript app

Jest cheat sheet

Automatically generate Go test boilerplate from your source code.

🐏 Simple and complete React hooks testing utilities that encourage good testing practices.

Property based testing framework for JavaScript (like QuickCheck) written in TypeScript

Testcontainers for Go is a Go package that makes it simple to create and clean up container-based dependencies for automated integration/smoke tests. The clean, easy-to-use API enables developers to programmatically define containers that should be run as part of a test and clean up those resources when the test is done.

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.

Full-stack testing PHP framework

Randomized testing for Go

Mimesis is a Python library for generating fake but realistic data in multiple languages and locales.

A Matcher Framework for Swift and Objective-C

Powerful, elegant and flexible test framework for Kotlin with assertions, property testing and data driven tests.

An online request replication and TCP stream replay tool, ideal for real testing, performance testing, stability testing, stress testing, load testing, smoke testing, and more.

Package for comparing Go values in tests

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.

:owl: Custom jest matchers to test the state of the DOM

Pa11y is your automated accessibility testing pal

A light-weight, flexible, and expressive statistical data testing library

Beyond the basics of Node.js testing. Including a super-comprehensive best practices list and an example app (April 2025)

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

A next-generation code testing stack for JavaScript.