OSIS-2805 Add missing test for prepare_xls_content method.
OSIS-2805 Add missing test for prepare_xls_content method.

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