Sounds like a solid test. I recently inspected my injectors, when I received what were SUPPOSED to be the new injector seals. I wanted to make certain that if I damaged the old ones I had backups.
Turns out the new ones are incorrect - or a differently-designed non-oem replacement. They look like donuts instead of a shaped rubber seal. I wondered if the old ones were still sealing properly - in preparation for OUR emission test. Didn't seem worthwhile just reordering the correct seals until I had a bigger order, but maybe I'll pay the extra for the inexpensive seals and get a set at the dealer. Cheap insurance.
'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7