Checked (out) (6)
'checked out' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tested that I've seen before include "Put through a trial" , "Proven" , "Trialled" , "Subjected to examination or trial" , "Put to the proof" .)
(Another definition for scoped that I've seen is " Viewed".)