def test_can_buy(self):
"""Test out the _can_buy helper method."""
deck = Deck()
deck.treasure = 3
deck.buys = 1
# Test too little treasure for the card
assert_equal(deck._can_buy(cards.Gold), False)
# Test just enough
assert_equal(deck._can_buy(cards.Silver), True)
# Test too much
assert_equal(deck._can_buy(cards.Copper), True)
