uninitialized constant ExceptionNotifiable deploy_with_migrations in TEST

I have installed the exception_notification plugin, and it works fine
when system is deployed to production. and I have not problems
deploying to dev, and not test environments. However, when I try to do
a deploy_with_migrations, I get the uninitialized constant
ApplicationController::ExceptionNotifiable error.

There must be something 'special' about the test env, but I haven't
seen anything to tell me to set env any differently. I really don't
want notifications in test, but don't want to disable for the other
environments.

So, I don't have a rails test environment.

Thanks for any help.

Cheers,
Paul