def test_can_upgrade_no_houses(self):
bi = Board(["red", "blue"], 10000)
bi.available_houses = 1
bi.purchase("red", 1)
bi.purchase("red", 3)
bi.upgrade("red", 1)
self.assertFalse(bi.can_upgrade("red", 1))
self.assertFalse(bi.can_upgrade("red", 3))
def test_can_downgrade_4_houses(self):
bi = Board(["red", "blue"], 10000)
bi.purchase("red", 1)
bi.purchase("red", 3)
bi.available_houses = 4
bi.upgrade("red", 1)
bi.upgrade("red", 1)
bi.upgrade("red", 1)
bi.upgrade("red", 1)
bi.upgrade("red", 1)
self.assertTrue(bi.can_downgrade("red", 1))
self.assertFalse(bi.can_downgrade("blue", 1))
