AI coding assistants generate better unit tests when the testing environment is properly configured. A project with Jest set up correctly, with examples of the testing style you want, and with TypeScript types available produces significantly higher-quality AI-generated tests than a project where the AI is inferring everything from scratch. This guide walks through configuring Jest for an AI-assisted workflow: the setup steps, the configuration choices that affect generated test quality, and the prompt patterns that work well once the environment is in place.…