Cleanup: More C++ like nature for word split test

While it looks more longer, but also contains more comments
about what's going on.

Surely, this function almost never breaks and investing time
into maintaining its tests is not that important, but we should
have a good, clean, understandable tests so they act as a nice
example of how they are to be written. Especially important to
show correct language usage, without old school macros magic.

Doing this at a lunch breaks, so will be series of some updates
in the area.

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