test_time_to_onroad: log events after onroad/timeout (#31359)

* log events

* only on fail

selfdrive/test/test_time_to_onroad.py

@@ -21,12 +21,15 @@ def test_time_to_onroad():
   sm = messaging.SubMaster(['controlsState', 'deviceState', 'onroadEvents'])
   try:
     # wait for onroad
+    try:
       with Timeout(20, "timed out waiting to go onroad"):
         while True:
           sm.update(1000)
           if sm['deviceState'].started:
             break
           time.sleep(1)
+    finally:
+      print(f"onroad events: {sm['onroadEvents']}")
 
     # wait for engageability
     with Timeout(10, "timed out waiting for engageable"):