elmah.ir-post114-code2.cs

 [Test]
[ExpectedException(typeof(InvalidOrderException))]
public void WhenAUserAttemptsToOrderAnItemWithAQuantityOfZeroThrowInvalidOrderException()
{
    //Arrange
    var shoppingCart = new ShoppingCart();
    shoppingCart.Items.Add(new ShoppingCartItem { ItemId = Guid.NewGuid(), Quantity = 0 });
    var customerId = Guid.NewGuid();
    var expectedOrderId = Guid.NewGuid();

    Mock.Arrange(() => _orderDataService.Save(Arg.IsAny<order>()))
    .Returns(expectedOrderId)
    .OccursOnce();

    //Act
    _orderService.PlaceOrder(customerId, shoppingCart);

    //Assert
    Mock.Assert(_orderDataService);
}
}