Add unit test coverage for Kolekti metric collecting
Add unit test coverage for Kolekti metric collecting

It was previously indirectly tested through the run method, but it's
better to be explicit.

Signed-off-by: Rafael Reggiani Manzo <c29d01c53e555ce25a3e9147de4eaa69596ae204@protonmail.com>

mezuro/kalibro_processor,mezuro/kalibro_processor