There is no option to test teams other then raiding. It would add a great strategic value for me and i bet many other players if there was an option to do this.
It is actually hard to test teams since you cant PvP against spesific teams or heroes you want (unless you reroll all day and loose food) and even then you might not be able to.
Lets say i want to compare Fully ascended Magni vs lower level Magni in action! We all know the numbers but there are too many variables to actually calculate or actually try play “smart” when theres timelimit in raids now. It would allow 1v1 between heroes.
Thats only one option and i dont know if its possible to make happen but something would be nice.