30DaysOfTDD_Day16_Part3

using System;
using System.Linq;
using NUnit.Framework;
using TddStore.Core;
using TddStore.Core.Exceptions;
using Telerik.JustMock;

namespace TddStore.UnitTests
{
    [TestFixture]
    class OrderServiceTests
    {
        private OrderService _orderService;
        private IOrderDataService _orderDataService;
        private ICustomerService _customerService;

        [TestFixtureSetUp]
        public void SetupTestFixture()
        {
            _orderDataService = Mock.Create<IOrderDataService>();
            _customerService = Mock.Create<ICustomerService>();
            _orderService = new OrderService(_orderDataService, _customerService);
        }

        [Test]
        public void WhenUserPlacesACorrectOrderThenAnOrderNumberShouldBeReturned()
        {
            //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
            var result = _orderService.PlaceOrder(customerId, shoppingCart);

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

        [Test]
        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)
                .OccursNever();

            //Act
            try
            {
                _orderService.PlaceOrder(customerId, shoppingCart);
            }
            catch(InvalidOrderException ex)
            {
                //Assert
                Mock.Assert(_orderDataService);
                Assert.Pass();
            }

            //Assert
            Assert.Fail();
        }
    }
}