improvement/OSIS-4056 add test for uncovered code
improvement/OSIS-4056 add test for uncovered code

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