Attack alone

My idea is: to I can attack my village with free troops,when I want to see how strong is my new base?

This isnt your idea. I see this suggestion about once a week.

This would lead to sandboxing issues, so I don't see this happening, sorry.

You can now beat all of the enemy bases in war because you can practice over and over again.

Indirectly u want the features of ♥♥♥♥...[sandboxing]....not gonna happen buddy