Unit Testing the Use of TransactionScope

Question

The preamble: I have designed a strongly interfaced and fully mockable data layer class that expects the business layer to create a TransactionScope when multip

Answer 1

After having thought through the same issue myself, I came to the following solution.

Change the pattern to:

using(var scope = GetTransactionScope())
{
    // transactional methods
    datalayer.InsertFoo();
    datalayer.InsertBar();
    scope.Complete();
}

protected virtual TransactionScope GetTransactionScope()
{
    return new TransactionScope();
}

When you then need to test your code, you inherit the Class under test, extending the function, so you can detect if it was invoked.

public class TestableBLLClass : BLLClass
    {
        public bool scopeCalled;

        protected override TransactionScope GetTransactionScope()
        {
            this.scopeCalled = true;
            return base.GetTransactionScope();
        }
    }

You then perform the tests relating to TransactionScope on the testable version of your class.