[POC] Add failing test basepath

As the admin class for sonata uses the `cmf_routing.dynamic.persistence.phpcr.route_basepath` this param should exist in every use case. When there are several paths (`route_basepaths`) this param should contain one of them, if the paremeter is set without of the list this one needs to be there.

I had several situations where the `cmf_routing.dynamic.persistence.phpcr.route_basepath` isn't available, when trying to add the admin class. So i opened the issue #225 and now i created some tests that fail.