add extra debug info to onroad test (#30067)

selfdrive/test/test_time_to_onroad.py

@@ -16,7 +16,7 @@ def test_time_to_onroad():
   proc = subprocess.Popen(["python", manager_path])
 
   start_time = time.monotonic()
-  sm = messaging.SubMaster(['controlsState', 'deviceState'])
+  sm = messaging.SubMaster(['controlsState', 'deviceState', 'carEvents'])
   try:
     # wait for onroad
     with Timeout(20, "timed out waiting to go onroad"):
@@ -38,7 +38,7 @@ def test_time_to_onroad():
     # once we're enageable, must be for the next few seconds
     for _ in range(500):
       sm.update(100)
-      assert sm['controlsState'].engageable
+      assert sm['controlsState'].engageable, f"events: {sm['carEvents']}"
   finally:
     proc.terminate()
     if proc.wait(60) is None: