diff --git a/selfdrive/selfdrived/tests/test_alertmanager.py b/selfdrive/selfdrived/tests/test_alertmanager.py
index b75a4d1cbe..b9a6c9d0a6 100644
--- a/selfdrive/selfdrived/tests/test_alertmanager.py
+++ b/selfdrive/selfdrived/tests/test_alertmanager.py
@@ -11,6 +11,7 @@ class TestAlertManager:
       Enforce that an alert lasts for max(alert duration, duration the alert is added)
     """
     for duration in range(1, 100):
+      print('duration', duration)
       alert = None
       while not isinstance(alert, Alert):
         event = random.choice([e for e in EVENTS.values() if len(e)])
@@ -18,22 +19,47 @@ class TestAlertManager:
 
       alert.duration = duration
 
-      # check two cases:
-      # - alert is added to AM for <= the alert's duration
-      # - alert is added to AM for > alert's duration
-      for greater in (True, False):
-        if greater:
-          add_duration = duration + random.randint(1, 10)
-        else:
-          add_duration = random.randint(1, duration)
-        show_duration = max(duration, add_duration)
-
+      # check one case:
+      # - if alert is re-added to AM before it ends the duration is extended
+      if duration > 1:
         AM = AlertManager()
-        for frame in range(duration+10):
-          if frame < add_duration:
+        show_duration = duration * 2
+        for frame in range(duration * 2 + 10):
+          print(frame)
+          if frame == 0:
+            AM.add_many(frame, [alert, ])
+            print('added!')
+
+          if frame == duration:
+            # add alert one frame before it ends
+            assert AM.current_alert == alert
             AM.add_many(frame, [alert, ])
-          AM.process_alerts(frame, {})
+            print('added!')
+          AM.process_alerts(frame, set())
+          print('alert', AM.current_alert)
 
           shown = AM.current_alert != EmptyAlert
           should_show = frame <= show_duration
-          assert shown == should_show, f"{frame=} {add_duration=} {duration=}"
+          print('shown', shown, 'should_show', should_show)
+          print()
+          assert shown == should_show, f"{frame=} {duration=}"
+
+      # # check two cases:
+      # # - alert is added to AM for <= the alert's duration
+      # # - alert is added to AM for > alert's duration
+      # for greater in (True, False):
+      #   if greater:
+      #     add_duration = duration + random.randint(1, 10)
+      #   else:
+      #     add_duration = random.randint(1, duration)
+      #   show_duration = max(duration, add_duration)
+      #
+      #   AM = AlertManager()
+      #   for frame in range(duration+10):
+      #     if frame < add_duration:
+      #       AM.add_many(frame, [alert, ])
+      #     AM.process_alerts(frame, set())
+      #
+      #     shown = AM.current_alert != EmptyAlert
+      #     should_show = frame <= show_duration
+      #     assert shown == should_show, f"{frame=} {add_duration=} {duration=}"