As a matter of interest, does your company also ask managers to go through a management test as part of the hiring process? Let them run a team for twenty minutes or an hour and evaluate them on that basis? If not, why not? :-)

I think "take-home" style tests are the only reasonable way to evaluate this kind of technical competency. They are the closest to realistic. Throw people a small problem of the kind they'll actually be asked to work on. Let 'em deal with it--including documenting their solution!