I wrote an article on successfully selling developer level testing in your organization for nPlus1. The article hits a lot of things I think are really important when talking to your management and team about implementing some form of developer testing.
You really do need to make sure you present an honest, well-thought case for testing before rolling in to it. Hopefully this article will help you if you’re searching for ammunition to help win that debate!
Go read it. Then go write some tests.