def test_double_down(self):
player = Player(bank=Bank(10), bet_amount=5)
deck = Deck(card_nums=[10, 9, 10, 5, 5])
game = Game(player=player, deck=deck)
game.start()
assert player.balance == 5
assert player.total == 10
player.double_down(deck.deal_one())
# Should double bet and withdraw
assert player.balance == 0
assert player.total == 20
game.dealer_go()
assert game.dealer.total == 19
assert player.status == Statuses["WIN"]
# Should win double original bet
assert player.balance == 20
