A reliable booking system starts with reliable authentication. In this tutorial, we’ll use Pytest and Playwright to test the Jersey City Pickleball Club (JCPC) website’s essential user flows—sign up, sign in, and sign out. Rather than simply checking whether a page loads, we’ll simulate real user interactions and verify that JCPC responds correctly at each step. By the end, you’ll have a practical foundation for building end-to-end authentication tests for a Flask application.