Tests: Sources and dependencies
===============================

Source index file for tests?
    - Should there be only one or multiple
      E.g. for "cumbersome" tests (ones that are very slow
      and/or require some external environment)?
        - Perhaps they should always be built?
          (to prevent code rot)

Dependencies for tests?
    - Often there are some additional deps.
    - Also, it is possible that a higher version is needed
      for some already-present deps.