OSIS-4002 : Add user into group (tests)
OSIS-4002 : Add user into group (tests)

uclouvain/OSIS-Louvain,uclouvain/osis,uclouvain/OSIS-Louvain,uclouvain/osis,uclouvain/osis,uclouvain/osis,uclouvain/OSIS-Louvain