Disable security firewall in test environment on Symfony2

I'm trying to disable a security firewall for a test environment in Symfony2, but i'm not having luck. Here's what i have in config_test.yml:

security:
    firewalls:
        web:
            pattern: .*
            security: false
            anonymous: ~

However, this is not disabling security. Any ideas how i can completely disable security for a certain firewall when in test env?