What is Authentication in tests in Laravel, and what role does it play in a real application?

What is Authentication in tests in Laravel, and what role does it play in a real application? In Laravel, authentication in tests should be understood as part of a larger application architecture rather than as an isolated API call. Tests can act as a user to exercise protected application flows. A strong understanding includes its purpose, the layer where it belongs, the data or request flow it affects, and the situations where another mechanism may be more appropriate. Practical context: Feature tests exercise application behavior through realistic HTTP requests, authentication, validation, routes and database interactions. The specific focus here is authentication in tests: Tests can act as a user to exercise protected application flows. This question is designed to test not only terminology, but also how the concept fits into Laravel's request, application, database, security, or deployment workflow.