public async Task MachineHasOne5EurBill_IfItsSlotIsEmptyAndAddOne5Eur()
{
var billList = new List <Bill> {
new Bill {
Value = 5, Quantity = 0
}
};
var mockRepository = ConfigureMockWithBills(billList);
var billService = new BillService(mockRepository.Object);
await billService.AddMoneyAsync(5, 1);
Assert.AreEqual(1, billList.Count);
Assert.AreEqual(1, billList.First().Quantity);
mockRepository.Verify(p => p.Add(It.IsAny <Bill>()), Times.Never);
}
