i keep stumbling over this use case:

https://github.com/liip/LiipFunctionalTestBundle/pull/70/files#L7R25
https://github.com/liip/LiipFunctionalTestBundle/pull/70/files#L1R13

what is the best practice here? is there one? is there something that we could change to make this easier? specifically i would love to avoid duplicating the definition. guess we could clone the original test.client definition in the extension?