Thank you so much for your replies and links, but we’ve seen a lot of variants of this kind of testing even live. btw among all videos this Eve’s daughter impressed me the most
http://www.youtube.com/watch?v=XdAARauDoKQ

For sure all mud and mess is not very attractive (though we can do it in cleanliness with trendy accessories), but do you agree it’s enough for basic testing?
1) emission flame of nozzle injection is visible
2) we can see that nozzle injection is of good quality
3) an injector is activated by electrical signal
4) this technician checks fuel value that goes back
Probably it’s only 5% that should be done for injector testing, but there’s minimal result.