My suggestion would be that lots of pilots in both wars and beyond would log flights as test flights in order to go up for a jolly or to actually test that some repair had been effected properly.
I remember my Dad telling me that in his (Mosquito) squadron, pilots would routinely take up one or more of the ground repair team to test out the quality of their work. This guaranteed that they always worked as if their lives depended on it. They did!
S