How to use Throws() here...

[James Legan]

I have a method that uses an OpenAccess model. I want to mock out an OptimisticVerificationException in the first (and only first) call to SaveChanges(). How can this be achieved?

public void ThrowTest(Guid id, string stringToUpdate)
       {
           var user = _model.Users.SingleOrDefault(p => p.Guid == id);
           if (user != null)
           {
               user.StringToUpdate = stringToUpdate;
               try
               {
                   _model.SaveChanges();
               }
               catch (OptimisticVerificationException optimisticVerificationException)
               {
                   _model.Refresh(RefreshMode.OverwriteChangesFromStore, user);
                   user.StringToUpdate = stringToUpdate;
                   _model.SaveChanges();
               }

           }
       }

[James Legan]

Here is the solution:

// Handles the first call
Mock.Arrange(() => _mockModel.SaveChanges()).Throws<OptimisticVerificationException>(string.Empty).InSequence();

// Handles the second call.
Mock.Arrange(() => _mockModel.SaveChanges()).InSequence();

[Ricky]

Hi James,
Thanks again for contacting us. It's great that you got the solution. However, you can also do specific Throws for different arguments.

Kind Regards
Mehfuz
the Telerik team

[James Legan]

Mehfuz,

Given my example, could you please provide an example of how the calls could be changed? 

Thanks,

Jim

[Ricky]

Hi James,

It’s great that you asked the question. However, you are right. I haven't noticed that SaveChanges is a void method. In that regard InSequence is the answer.

Kind Regards
Mehfuz
the Telerik team