def test_return_change_none_required():
vending_machine = VendingMachine()
vending_machine.insert_dollar()
vending_machine.insert_quarter()
vending_machine.insert_quarter()
your_stuff: (Item, MoneyStack) = vending_machine.vend_item('C')
assert your_stuff[1].nickels == 0
assert your_stuff[1].dimes == 0
assert your_stuff[1].quarters == 0
assert your_stuff[1].dollars == 0
def test_coin_return():
vending_machine = VendingMachine()
vending_machine.insert_nickel()
vending_machine.insert_dime()
vending_machine.insert_quarter()
vending_machine.insert_dollar()
returned_coins: MoneyStack = vending_machine.coin_return()
assert returned_coins.dollars == 1
assert returned_coins.quarters == 1
assert returned_coins.dimes == 1
assert returned_coins.nickels == 1
def test_insert_quarter():
vending_machine = VendingMachine()
vending_machine.insert_quarter()
assert vending_machine.vending_stack.quarters == 1