Tests like OP is searching for (which are only useful if done in real world conditions) vary greatly if you are testing the low light performance of a higher ISO, or if you are testing that same ISO in adequate light and using it specifically to buy yourself a faster shutter speed/smaller aperture, etc..
My suggestion for testing is just shoot as you normally would with what ever you are testing, try to get good pictures, and if time allows, take the same picture multiple times with a wide variety of settings. EXIF data will tell you which is which when you get them back to your computer, and other than that, just try to keep extra variables like camera shake and focus, etc., consistent so that your tests are more useful. After you do this quite a bit, you will know how to best use the camera + lens you are testing and get the best out of it and that is really a big key to getting great pictures before the editing stage begins.
Everyone, myself admittedly included, worries so much about non-real world details and it's a mind killer. Just use what you got/buy what you can afford/you know you can profit from, and learn to test/use that to it's best, then go rent/try any new equipment and test the hell out of it before you buy it. If the upgrade is worth it to your art or is clearly a worthy investment, then you don't have to worry so much. I say this as a persevarate endlessly about which lens I'm going to sell and which one I'm going to buy next or if I'm selling a lens at all or buying a lens at all, if I need another camera body...... Decisions, decisions.
