Add option to automatically check out all attendees at night (#1819)

src/tests/api/test_checkin.py

@@ -143,6 +143,7 @@ TEST_LIST_RES = {
     "allow_multiple_entries": False,
     "allow_entry_after_exit": True,
     "subevent": None,
+    "exit_all_at": None,
     "rules": {}
 }