Idea for testing your base

A great idea could be that, you could test your base defense
by sending fake troops in to see how your defense will do.
the idea is that you will be able to send in troops that you have made yourself
e.g you buy 20 barbarians then in the testing part you will be able to send in 20 barbarians
hope you like the idea

Better if u have a building for testing, in that u will buy troops for low cost and u can only start with it when u got the same amount of troops in army camps and start, even new achievement for this will be great