Asp.Net MVC Tutorial Unit Tests
- by Nicholas
I am working through Steve Sanderson's book Pro ASP.NET MVC Framework and I having some issues with two unit tests which produce errors.
In the example below it tests the CheckOut ViewResult:
[AcceptVerbs(HttpVerbs.Post)]
public ViewResult CheckOut(Cart cart, FormCollection form)
{
// Empty carts can't be checked out
if (cart.Lines.Count == 0)
{
ModelState.AddModelError("Cart", "Sorry, your cart is empty!");
return View();
}
// Invoke model binding manually
if (TryUpdateModel(cart.ShippingDetails, form.ToValueProvider()))
{
orderSubmitter.SubmitOrder(cart);
cart.Clear();
return View("Completed");
}
else // Something was invalid
return View();
}
with the following unit test
[Test]
public void Submitting_Empty_Shipping_Details_Displays_Default_View_With_Error()
{
// Arrange
CartController controller = new CartController(null, null);
Cart cart = new Cart();
cart.AddItem(new Product(), 1);
// Act
var result = controller.CheckOut(cart, new FormCollection {
{ "Name", "" }
});
// Assert
Assert.IsEmpty(result.ViewName);
Assert.IsFalse(result.ViewData.ModelState.IsValid);
}
I have resolved any issues surrounding 'TryUpdateModel' by upgrading to ASP.NET MVC 2 (Release Candidate 2) and the website runs as expected.
The associated error messages are:
*Tests.CartControllerTests.Submitting_Empty_Shipping_Details_Displays_Default_View_With_Error:
System.ArgumentNullException : Value cannot be null.
Parameter name: controllerContext*
and the more detailed
at System.Web.Mvc.ModelValidator..ctor(ModelMetadata metadata, ControllerContext controllerContext)
at System.Web.Mvc.DefaultModelBinder.OnModelUpdated(ControllerContext controllerContext, ModelBindingContext bindingContext)
at System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
at System.Web.Mvc.Controller.TryUpdateModel[TModel](TModel model, String prefix, String[] includeProperties, String[] excludeProperties, IValueProvider valueProvider)
at System.Web.Mvc.Controller.TryUpdateModel[TModel](TModel model, IValueProvider valueProvider)
at WebUI.Controllers.CartController.CheckOut(Cart cart, FormCollection form)
Has anyone run into a similar issue or indeed got the test to pass?
