Dive into a comprehensive tutorial on building PHP eCommerce entities using Doctrine ORM and MySQL, while implementing robust testing with PHPUnit. Learn to create and manage products, orders, and items, exploring their relationships and interactions. Master essential concepts such as project setup, entity creation, database-dependent testing, schema management, and custom assertions. Develop practical skills by implementing features like product pages, checkout processes, and order management. Gain insights into best practices for database assertions, entity relationships, and form handling. By the end of this tutorial, you'll have a solid foundation in creating and testing complex eCommerce systems using PHP, Doctrine ORM, and PHPUnit.