Testing against third-party DB

Hello,

I am developing module which provides integration with another software. I am using different "target" in settings.php to access DB for this third-party application.

Now if I write test, I need to have this target defined in test case too. Right now I am defining it manually via Database::addConnectionInfo in setUp() method, but this is not portable..

Any ideas how to do such type of testing?

Regards,
Pavel