public void Buy_budget500_cost700_resultArgumentException()
{
// arrange
int budget = 500;
int cost = 700;
// act
Cashbox cashbox = new Cashbox(budget);
cashbox.Buy(cost);
}
public void Buy_budget1000_cost700_result300()
{
// arrange
int budget = 1000;
int cost = 700;
int expected = 300;
// act
Cashbox cashbox = new Cashbox(budget);
cashbox.Buy(cost);
int actual = cashbox.Budget;
// assert
Assert.AreEqual(expected, actual);
}