Make user 7 admin, student and teacher

backend/fill_database_mock.py

@@ -205,6 +205,8 @@ def fill_database_mock() -> None:
         student7 = create_student(session, "Stef", "[email protected]")
         student8 = create_student(session, "Mathieu", "[email protected]")
 
+        modify_user_roles(session, student7.id, [Role.STUDENT, Role.ADMIN, Role.TEACHER])
+
         # Create teachers
         teacher1 = create_teacher(session, "Kris Coolsaet", "[email protected]")
         teacher2 = create_teacher(session, "Sophie Devolder", "[email protected]")