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Clear filtersMocking replaces a real dependency with a controllable fake so a test can run in isolation and check how the code interacts with it; use it for slow, non-deterministic or external dependencies, not for everything.
Transient services are created every time they are requested, scoped services are created once per HTTP request, and singleton services are created once and shared for the life of the application.
A decorator is a function that takes another function and returns a modified version of it, letting you add behaviour such as logging, caching or access control without changing the original code.