The check isn't did, try to add theses events in events.md:
acp_wrong_event_one
===
* Location: adm/style/my_file.html
* Since: 3.1.0-a3
* Purpose: None-existent file

acp_wrong_event_two
===
* Location: app.php
* Since: 3.1.0-a3
* Purpose: Weird event