Add tests for instance shared search module

• Tester le module shared-search de l'instance

added Improvment label

assigned to @tguillas

added To Do label

added Doing label and removed To Do label

created merge request !21 (merged) to address this issue

mentioned in merge request !21 (merged)

mentioned in commit e6f90a98

closed with merge request !21 (merged)

mentioned in merge request !23 (merged)

mentioned in commit cff4c496

removed Doing label