private static XElement serialize()
{
var world = TestWorldBuilder.createTestWorld(10, 10);
var store = new GenericDatastore(world);
var list = store.RootRecord.GetList("Towns", r => new Town(null, r));
var town = new Town(createService(), store.RootRecord.CreateRecord());
town.SetTownCenter(world.GetVoxel(new Point2(3, 8)));
list.Add(town);
town.AddVoxel(world.GetVoxel(new Point2(3, 7)));
var doc = store.Serialize();
return(doc);
}