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Titanoboa is a Vyper interpreter and testing framework that provides a modern, integrated development experience for Vyper smart contracts. It enables developers to test and debug Vyper contracts directly within Python, offering features like pretty tracebacks, forking, debugging capabilities, pytest integration and out-of-the box fuzzing. Beyond its standalone capabilities, Titanoboa serves as the foundation for other popular testing frameworks like Ape and Moccasin, and is a core piece of infrastructure for the Vyper ecosystem.

solidity-coverage provides smart-contract code coverage for the Hardhat developer platform. It's highly accurate, supports full viaIR solidity compilation and a large set of solidity-specific code branch patterns. It's installed on ~230k Github projects and is downloaded ~100k times a week from NPM.

Synpress is an end-to-end testing framework for web applications based on Cypress.io and Playwright, with support for MetaMask. It is a pioneering tool in web3 end-to-end testing with the potential to evolve into a decentralized network of test runners and continuous integration providers in the future. Synpress is easy to use, fully tested, and includes features such as MetaMask support, headless mode, integrated video recording, and many more. It is also blazingly-fast and extensible, with the ability to add custom commands and plugins. Synpress is already used by many open-source repositories.