Move PSR compliant tests to the apropriate namespaces

Having "inc" in the namespace is awkward. Instead the test class
namespaces now correspond to their real class namespaces.

With further refacto

Move PSR compliant tests to the apropriate namespaces

Having "inc" in the namespace is awkward. Instead the test class
namespaces now correspond to their real class namespaces.

With further refactorings we should get rid of most of the stuff in
tests/inc

this is a continuation of #3812

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