Have you had to work with permissions? What are they and what are the features of their testing?

Yes, I have worked with permissions in various systems.

Main types of permissions:

• Role-based Access Control (RBAC): rights are assigned to roles, and users acquire roles.
• Discretionary Access Control (DAC): the resource owner determines who can do what.
• Mandatory Access Control (MAC): rights are defined by security policies and do not depend on the owner.

Features of permission testing:

• Check access for different roles and users.
• Test both positive scenarios (access granted) and negative ones (access denied).
• Ensure there are no bypasses through other interfaces or APIs.
• Automate tests to quickly verify changes in access logic.

Example: if there is an "administrator" role, the test should confirm that the administrator can create and delete records, while a regular user cannot.