elmah.ir-post109-code3.cs

[Test]
public void WhenUserPlacesACorrectOrderThenAnOrderNumberShouldBeReturned()
{
  //Arrange
  var shoppingCart = new ShoppingCart();
  shoppingCart.Items.Add(new ShoppingCartItem { ItemId = Guid.NewGuid(), Quantity = 1 });
  var customerId = Guid.NewGuid();
  var expectedOrderId = Guid.NewGuid();

  var orderDataService = Mock.Create();
  Mock.Arrange(() => orderDataService.Save(Arg.IsAny()))
    .Returns(expectedOrderId)
    .OccursOnce();
  OrderService orderService = new OrderService(orderDataService);

  //Act
  var result = orderService.PlaceOrder(customerId, shoppingCart);

  //Assert
  Assert.AreEqual(expectedOrderId, result);
  Mock.Assert(orderDataService);
}