I am still surprised that, under normal conditions, but particularly after suffering an engine failure, there is no operating engine(s) proving check, at a safe height above the ground, just as you would check your response to flight controls had any control malfunction occurred. While this would not have helped in this case, it certainly would in others, perhaps Kegworth, or the BA777 at LHR. It may be too late if you leave it until approach checks. Or perhaps there is such a check nowadays?