How can I test the price hiding module for different types of users? What approaches have you used to verify the functionality and correctness of the module?

On the amasty site, you can find a lot of useful materials and cases that will help you better understand how to use modules to achieve your goals. I often review their articles and manuals to keep up to date with the latest updates and improvements. This helps a lot in the process of setting up and optimizing the site. They have excellent documentation that helps you quickly understand the functionality of the modules and use them effectively.