public string ReceiptOneDefy(int amount)
{
var lineDiscount = new DiscountStrategyCalculator <LineViewModel>();
lineDiscount.Configure()
.When(line => line.Quantity >= 20 && line.Price >= 1000)
.ApplyDiscount(line => line.Quantity * line.Price * 0.1m);
var orderVm = new OrderViewModel(Substitute.For <IDiscountCalculator <OrderViewModel> >(), lineDiscount, new Order("Anywhere Bike Shop", "USD", 0.0725m));
orderVm.AddLine(new Line(Defy, amount));
var generator = new StringReceiptBuilder();
return(generator.GenerateReceipt(orderVm));
}
public void Should_GetDiscount_With_MinOperation_Mins_Discounts()
{
var sut = new DiscountStrategyCalculator <Order>(DiscountStrategyOperations.Min);
sut.Configure()
.When(_ => true)
.ApplyDiscount(_ => 20m)
.When(_ => true)
.ApplyDiscount(_ => 60m);
var discount = sut.GetDiscount(new Order(Arg.Any <string>(), Arg.Any <string>(), 0.0725m));
Assert.That(discount, Is.EqualTo(20m));
}
public void Should_AddCalculator_Compose_With_Itself()
{
var calculator = new DiscountStrategyCalculator <Order>(DiscountStrategyOperations.Sum);
var otherCalculator = new DiscountStrategyCalculator <Order>();
calculator.Configure()
.When(_ => true)
.ApplyDiscount(_ => 42m);
otherCalculator.Configure()
.When(_ => true)
.ApplyDiscount(_ => 42m);
calculator.AddCalculator(otherCalculator);
Assert.That(
calculator.GetDiscount(new Order(Arg.Any <string>(), Arg.Any <string>(), 0.0725m)),
Is.EqualTo(84m));
}
public void Should_AddCalculator_Throw_ArgumentException_When_Cyclic_References()
{
var sut = new DiscountStrategyCalculator <Order>();
Assert.Throws <ArgumentException>(() => sut.AddCalculator(sut));
}