certificate: add test to Certification model
certificate: add test to Certification model

GustavoVS/timtec,virgilio/timtec,mupi/timtec,mupi/timtec,mupi/timtec,hacklabr/timtec,virgilio/timtec,virgilio/timtec,hacklabr/timtec,virgilio/timtec,GustavoVS/timtec,hacklabr/timtec,GustavoVS/timtec,hacklabr/timtec,GustavoVS/timtec,mupi/timtec