If you just want to test it you need:
A sealed enviroment in which there are:
1 alien, 1 human spawns
info_alien_infomission
info_human_infomission
info_player_infomission
No leaks to the void in your brushwork
then compile that using the Toolbar option >> Build >> (Single) BSP -meta
Ingame, pull down console, type
/sv_pure 0
/devmap yourmapname
As for the spawns, make sure none of your spawns (alien, human game spawns) are trapped in any brushes, suspend them above the ground.
Also check that you have ALL 3 INFOMISSIONS somewhere within your map (alien_infomission etc)