EDIT. This reply only apply to SR6.
You can use your Edge as long as long as it is not related in any way with taking a test made with a skillsoft.
Add 3 to your Initiative Score, Give ally 1 Edge, Negate 1 Edge of a foe, Heal one box of Stun damage, Heal 1 point of Physical damage, Create special effect, Tactical Roll, Hog, ...