Map Editor Test Game Environment

As a player who likes to develop new games in the map editor, it would be nice to have a test game environment as part of the map editor. A test game environment would be similar to a real game environment with a few differences. In a test game environment a tester would have the ability to start a new game in which he plays multiple players. This would decrease the number of game bugs in real games as well as provide an opportunity for a test player to see how a game 'plays' in a game-like situation. The test game would only be visible to the game tester(s), preventing those situation where players jump into, what they think is a real game, only to be told it is a test game. The game tester(s) would not receive any SP's or any other benefits for playing a test game.

This kind of already exists, as you can just set a game to private with password. Sure you can't play multiple factions/nations, but you can get friends to do that and just give them the password.