Nesting transaction scopes for integration tests using Rhino Commons UnitOfWork - nhibernate

Question

I'm trying to set up a integration test class that wraps each test in a transaction. This way I can rollback the transaction after each test instead of resetting the DB before each test.
I also want to be able to use transactions in the integration tests themselves.
I am using NHibernate and the Rhino Commons UnitOfWork for the the project. I am using MSTest for the tests.
I want something like this:
[TestInitialize]
public void TestInit() {
// create outer transaction scope
UnitOfWork.Start();
UnitOfWork.Current.BeginTransaction();
}
[TestCleanup]
public void TestCleanup() {
// rollback outer transaction
UnitOfWork.Current.Dispose();
}
[TestMethod]
public void IntegrationTest() {
using (UnitOfWork.Start(UnitOfWorkNestingOptions.CreateNewOrNestUnitOfWork)) {
UnitOfWork.Current.BeginTransaction();
// integration test code
UnitOfWork.Current.TransactionalFlush();
// possibly more transactions
}
}
This is the first time I have used NHibernate, Rhino Commons, and MSTest. I am not clear on the behavior of sessions with nested Rhino Commons UnitOfWorks. What I have here does not rollback the changes from the integration test.
I tried using TransactionScope from System.Transactions, but get the following error when the UnitOfWorks end:
System.InvalidOperationException: Disconnect cannot be called while a transaction is in progress..
So here are my questions:
Is there a way to get this behavior with UnitOfWork in Rhino Commons? If not, should I just reset the database before each test or is there another way to nest transactions that plays nicely with the UnitOfWork?
Thank you.

Answer 1

I believe UnitOfWork.Start().BeginTransaction() returns a RhinoTransaction. So to make it more clear you can try to rewrite the code as this:
using(IUnitOfWork uow = UnitOfWork.Start(UnitOfWorkNestingOptions.CreateNewOrNestUnitOfWork))
{
RhinoTransaction tx = uow.BeginTransaction();
.
.
.
.
tx.Rollback();
}
Be warned though, I have not tried the code above, let me know if it works.