The Replay newsletter is a weekly resource for development and engineering leaders, focusing on frontend development, AI tools, and modern software trends. Test-Driven Development (TDD) is recognized for its effectiveness in creating reliable REST APIs, but it presents challenges in UI development due to the nature of UI testing, which often requires simulating user actions and checking UI states. QA Wolf, a tool designed to simplify UI testing, addresses these challenges by converting user actions into Playwright/Jest code without requiring boilerplate code. It automates test generation using a Chromium browser instance and Puppeteer, offering features like page load waiting, element selector optimization, CI integration, and cross-browser testing. QA Wolf's interactive REPL allows customization and supports snapshot testing, enabling developers to capture and compare UI states over time. Additionally, QA Wolf emphasizes selector specificity to ensure accurate element targeting. It also supports session management and other practical testing needs through various APIs. Overall, QA Wolf provides a seamless approach to setting up and executing UI tests, making it a valuable tool for developers seeking an efficient testing framework.