In my MVC4 application almost every method does something with a database. Now I want to test these methods and I looked at this tutorial to do so. It is recommended there to use Moq to make mock objects.
In this particular case I want to test my GetTotal method of the ShoppingCart class (based on Microsoft Tutorial) which depends on the AddToCart method which look like this
public class ShoppingCart() {
projectContext db = new projectContext ();
public virtual void AddToCart(Product product)
{
var cartItem = db.Carts.SingleOrDefault(
c => c.CartId == ShoppingCartId
&& c.ProductId == product.ProductId);
if (cartItem == null)
{
cartItem = new Cart
{
ProductId = product.ProductId,
CartId = ShoppingCartId,
Count = 1,
DateCreated = DateTime.Now
};
db.Carts.Add(cartItem);
}
else
{
cartItem.Count++;
}
db.SaveChanges();
}
public virtual decimal GetTotal()
{
decimal? total = (from cartItems in db.Carts
where cartItems.CartId == ShoppingCartId
select (int?)cartItems.Count *
cartItems.Product.Price).Sum();
return total ?? decimal.Zero;
}
}
As can be seen both methods depend on the projectContext instance db.
When testing these methods I wanted to use mock objects like this:
[TestClass]
public class ShoppingCartTest : DbContext
{
[TestMethod]
public void GetTotalTest()
{
// Arrange
var _cart = new Mock<ShoppingCart>() { CallBase = true };
var _mock = new Mock<Product>() { CallBase = true };
_mock.SetupGet(m => m.Price).Returns(10.00M);
// Act
_cart.AddToCart() // cannot find method since no definiton can be found
// Assert
Assert.AreEqual(10.00M, _cart.GetTotal());// cannot find GetTotal method since no definiton can be found
}
}
How can I possibibly test these methods? Is it possible to just create a "fake" database and use that? Or can I adjust the mock objects in a way that methods can be used on them (using "mock methods" seems to me like missing the point of testing the actual methods...)?
