change unit testing framework cppunit to a more modern one
cppunit test seems to not be very well supported by gitlab and need converseion additionnaly, this framework may not be the one recommanded for c++ project (it is not listed here https://learn.microsoft.com/fr-fr/visualstudio/test/writing-unit-tests-for-c-cpp?view=vs-2022 )
we should consider moving to google test for example