Tester Logins and Spring Security

We would like to be able to create a url and controller to handle direct login to our webapp without going through our current authentication scheme for testing/automation purposes. i.e. /testLogin?username=user&password=pass and now user is authenticated for the webapp. We are using spring 3.0.7 and spring security 3.1.3 so we can't use a spring profile for our dev environments to create a custom authentication scheme. Is there anything else I can do? Please let me know if I can clarify.