Neon Testing is an open-source utility developed by Mikael Lirbank that simplifies database integration testing by automating the lifecycle of Neon branches for tests conducted with Vitest. It provides isolated, disposable test environments by creating a fresh Postgres branch for each test file, ensuring that tests are run against a realistic copy of the production database schema with all constraints intact. This approach addresses the challenges of managing containers, seeding data, and applying migrations typically associated with integration testing, thereby reducing the risk of false positives and facilitating the identification of issues that might arise in production. Neon Testing integrates seamlessly with Vitest, allowing developers to focus on writing tests rather than managing infrastructure, and is available for use via npm and GitHub.