Testing if a new City State works

[Firebug]

Is there some way to guarantee a city state will appear in a game so you can test it? I've been trying to add new city states to the game, and want to know the quickest way to find out if they're working.

 

[mrc2022]

Looking for an answer as well as I need to replace Lisbon

 

[Gedemon]

delete all others from the game's database, there is not a lot of way to do that (another would be to create a map size that can handle all CS including yours)