Testing

Bash Automated Testing System

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.

Tuist builds infrastructure for faster, more reliable build and test workflows across developers, CI, and coding agents. Shared cache, tests, and insights that sit alongside your existing CI.

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

Open source device layer for AI coding agents: a CLI, MCP server, and typed Node.js API to control mobile, web, TV, and desktop apps on devices and simulators, locally or in the cloud.

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

Official TestSprite CLI — AI-powered automated testing from your terminal

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.

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

Full-stack testing PHP framework

Randomized testing for Go

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

: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)