[Sirius][Test] Improve Dnd tests

Bugzilla Link	580349
Status	NEW
Importance	P3 enhancement
Reported	Jul 07, 2022 05:01 EDT
Modified	Jul 07, 2022 05:01 EDT
Version	0.7.0
Blocks	578826

Description

Currently, the DnD tests takes the drop tool ID as parameter. We should be able to test that there is only one tool allowing to drop a given element.