public void CanAddBattleshipToPlain()
{
var mockPlain = new Mock <IHaveBattleships>();
var service = new BattleService();
var battleship = new Battleships.StateManager.Entities.Battleship(new Position(1, 1), new Position(2, 1));
service.AddBattleship(mockPlain.Object, battleship);
mockPlain.Verify(x => x.AddBattleship(battleship), Times.Once);
}