The changes here are heterogeneous:
- Include stuff that is not available (other test has included it).
Sometimes local to a unit test, others in setupBeforeClass() or
globally, ... depends on every case.
- Rename some tests (namespaces, test name, ...) towards getting it
running.
- Amend small bits here and there.
Important note: I've left any "cosmetic" warning out from the
changes, only a few errors (like long array syntax) have been fixed.