Should get.snackbar be directly in the controller or on the widgets page?

[lincolnmedicinadireta]

My doubt arises because I saw a code which called the snackbar function direct from controller. Can everyone help me to understand if this is right?
I trying make a unit test but are a little complicated...

Thank you everyone

[ZhuJHua]

Getx uses a global navigatorKey to access State, so you can open new routes without relying on context.