Add tests for instance search module

• Tester le module search de l'instance

added Improvment label

assigned to @tguillas

added Doing label

created merge request !18 (merged) to address this issue

mentioned in merge request !18 (merged)

closed with merge request !18 (merged)

mentioned in commit 6dd7cb40

mentioned in merge request !19 (merged)

mentioned in commit 063d8b9b

mentioned in merge request !20 (merged)

removed Doing label

mentioned in commit dad7b891