[Fact] // behavioural or communication (white box)
public void Successful_booking_should_capture_payment()
{
// arrange
var id = Guid.NewGuid().ToString();
// managed dependency - concrete instance
var bookingRepository = new BookingRepositoryMongoDB(this.mongoClient);
// unmanaged dependency - interface
var priceCalculator = A.Fake <IPriceCalculator>();
var paymentGateway = A.Fake <IPaymentGateway>();
var sut = new BookingService(bookingRepository, paymentGateway, priceCalculator);
// act
sut.CreateBooking(new BookingService.CreateBookingRequest(id, "jason"));
// assert
A.CallTo(() => paymentGateway.CapturePayment(A <decimal> .Ignored)).MustHaveHappened();
}
[Fact] // state based (black box)
public void Successful_booking_should_be_persisted()
{
// arrange
var id = Guid.NewGuid().ToString();
var bookingRepository = new BookingRepositoryMongoDB(this.mongoClient);
// unmanaged dependency - interface
var paymentGateway = A.Fake <IPaymentGateway>();
var priceCalculator = A.Fake <IPriceCalculator>();
var sut = new BookingService(bookingRepository, paymentGateway, priceCalculator);
// simulate that the payment fails
A.CallTo(() => paymentGateway.CapturePayment(A <decimal> .Ignored)).Returns(true);
// act
sut.CreateBooking(new BookingService.CreateBookingRequest(id, "jason"));
var booking = bookingRepository.GetById(id);
// assert
booking.Id.Should().Be(id);
}
[Fact] // behavioural or communication (white box)
public void Should_use_total_price_from_price_service()
{
// arrange
var id = Guid.NewGuid().ToString();
// managed dependency - concrete instance
var bookingRepository = new BookingRepositoryMongoDB(this.mongoClient);
// unmanaged dependency - interface
var priceCalculator = A.Fake <IPriceCalculator>();
var paymentGateway = A.Fake <IPaymentGateway>();
var sut = new BookingService(bookingRepository, paymentGateway, priceCalculator);
// use price calculator as stub
A.CallTo(() => priceCalculator
.GetPriceForBookingWith(A <int> .Ignored, A <int> .Ignored))
.Returns(100);
// act
sut.CreateBooking(new BookingService.CreateBookingRequest(id, "jason"));
// assert
A.CallTo(() => paymentGateway.CapturePayment(100)).MustHaveHappened();
}
