How to make sure that the brake cable anchor bolt properly holds the cable?

I am referring to the bolt, in the V-brake, that holds the cable on the opposite side of the noodle (as in this question). Yesterday I loosened that bolt to take the wheel off (I learned later that there is an easier way, it is enough to take out the noodle), and even though I fastened it again after putting the wheel back, I don’t know how to check if I did it properly enough, and that the cable won’t just come loose while I ride and cause the brake to stop working. Of course, I tried the brakes a couple of times, even while circling on the bike, and they seemed ok. But the question remains:

Is there a way to make sure that the cable will never come off from under the bolt? I.e., that 1.) it seats deep enough (and with enough of its surface *) under the bolt AND 2.) that the bolt is tight enough?

* Another question I asked myself is: why is (was) the cable guided only on the top and side of the bolt? Why not give it a full turn, so that it has more surface under the bolt? Would the only problem be, that then it would be sticking upwards, instead of downwards?

N.B.: Even though in this case I unfastened and fastened it (although it was not necessary to do so), the question could apply to many other scenarios (installing new brakes, making sure a newly bought bike, or a bike unused for a long time are safe, …)