Most champs have a specific role according to their skills.
If you look at Youtube videos, many CCs test champs for Damage and have their own standard setup for it. The other abilities can be quantified rather well by looking at the skills and their cooldown times.
Peydma for example can hit pretty hard. I have her as a main champ on a secondary account. But aside from hardhitting, I find her ability to steal buffs much more useful.
If you want to have an impression about the abilities and strong sindes of a champ, I would recommend looking at various websites (not only one) describing the champs and their role.
Naturally you can set up your own testfield...but you should than regard the different roles. Arbiter most likely will not be able to ountnuke a Foli or Trunda...her role is different and at least equally important. There are many nukers....but only one Arbiter....