diff --git a/backend/src/shared/services/access_control.service.ts b/backend/src/shared/services/access_control.service.ts
index d1af7919..5faa9490 100644
--- a/backend/src/shared/services/access_control.service.ts
+++ b/backend/src/shared/services/access_control.service.ts
@@ -13,15 +13,16 @@ export class AccessControlService implements IAccessControlService {
     this.mapRoleToPriority();
   }
 
-  private mapRoleToPriority(): void {
+  private mapRoleToPriority(): Map<string, number> {
     const sortedRoles = this.roleService.sortRoles(Object.values(Role));
     if (sortedRoles?.length) {
-      sortedRoles.reduce((map, role) => {
+      const rolesPriorityMap = sortedRoles.reduce((map, role) => {
         map.set(role, this.priority);
         this.priority++;
         this.hierarchies.push(map);
         return map;
       }, new Map<string, number>());
+      return rolesPriorityMap;
     }
   }