This script didn't have tests defined. Now, the objects on this tool have
tests to verify its functionality, as well as the core method called to do
all the processes to provide a sorted list of the marge queue.
Signed-off-by: Sergi Blanch Torne <sergi.blanch.torne@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37395>
