Fix notifier verification coverage

server/tests/test_detector.py

@@ -7,7 +7,7 @@ from sqlalchemy.ext.asyncio import async_sessionmaker
 
 from monlet_server.models import Agent, Check, Event, Incident, NotificationOutbox
 from monlet_server.services.detector import LIVENESS_CHECK_ID, _tick
-from monlet_server.settings import reset_settings_cache
+from monlet_server.settings import get_settings, reset_settings_cache
 
 from ._helpers import make_event, register_agent
 
@@ -19,15 +19,20 @@ async def test_detector_transitions(app_client, ui_auth_headers, engine, session
     await register_agent(app_client, ui_auth_headers, "agent-dead")
 
     now = datetime.now(UTC)
+    settings = get_settings()
+    assert settings.stale_after_sec < settings.dead_after_sec
+    stale_age = settings.stale_after_sec + (
+        (settings.dead_after_sec - settings.stale_after_sec) / 2
+    )
     await session.execute(
         update(Agent)
         .where(Agent.agent_id == "agent-stale")
-        .values(last_seen_at=now - timedelta(seconds=120))
+        .values(last_seen_at=now - timedelta(seconds=stale_age))
     )
     await session.execute(
         update(Agent)
         .where(Agent.agent_id == "agent-dead")
-        .values(last_seen_at=now - timedelta(minutes=10))
+        .values(last_seen_at=now - timedelta(seconds=settings.dead_after_sec + 10))
     )
     await session.commit()