‘Stuff’ that must be tested will be listed in the FCOM and AFM.
Otherwise leave it alone!. It could be argued that the more often something is cycled, the closer you bring it to failure. Landing lights come to mind. If they worked OK last night, chances are they will work tonight without you flicking them on and off, ‘just to check’ (and after the engineers probably already checked).
But of course if your anal SOP says to do it, you do it.