diff --git a/tests/test_engine.py b/tests/test_engine.py
deleted file mode 100644
index 17cff82..0000000
--- a/tests/test_engine.py
+++ /dev/null
@@ -1,97 +0,0 @@
-from __future__ import annotations
-
-import unittest
-from datetime import datetime, timedelta, timezone
-
-from fluxer_admin_alerts.engine import decide
-from fluxer_admin_alerts.sources import Item
-from fluxer_admin_alerts.state import AlertRecord
-
-NOW = datetime(2026, 1, 10, 12, 0, tzinfo=timezone.utc)
-REALERT = timedelta(hours=12)
-SOURCE = "pending_registrations"
-
-
-def make_item(opened_at=None, reminder_after=None) -> Item:
-    return Item(
-        key="registration:1",
-        title="Account waiting for approval",
-        detail="User: test",
-        path="/registrations",
-        opened_at=opened_at,
-        reminder_after=reminder_after,
-    )
-
-
-def run_decide(now, items, known, checked=frozenset({SOURCE}), realert=REALERT, notify_cleared=True):
-    seen = {item.key: (SOURCE, item) for item in items}
-    return decide(now, seen, known, set(checked), realert, notify_cleared)
-
-
-def as_known(plan):
-    return {r.key: r for r in plan.records}
-
-
-class DecideTests(unittest.TestCase):
-    def test_new_item_alerts_once(self):
-        first = run_decide(NOW, [make_item()], {})
-        self.assertEqual([n.kind for n in first.notices], ["new"])
-
-        second = run_decide(NOW + timedelta(hours=1), [make_item()], as_known(first))
-        self.assertEqual(second.notices, [])
-
-    def test_repeats_after_realert_interval(self):
-        first = run_decide(NOW, [make_item()], {})
-        later = run_decide(NOW + timedelta(hours=12), [make_item()], as_known(first))
-        self.assertEqual([n.kind for n in later.notices], ["repeat"])
-
-    def test_realert_disabled(self):
-        first = run_decide(NOW, [make_item()], {}, realert=None)
-        later = run_decide(NOW + timedelta(days=30), [make_item()], as_known(first), realert=None)
-        self.assertEqual(later.notices, [])
-
-    def test_report_reminder_after_stale_threshold(self):
-        report = make_item(opened_at=NOW, reminder_after=timedelta(hours=48))
-        first = run_decide(NOW, [report], {})
-        self.assertEqual([n.kind for n in first.notices], ["new"])
-
-        at_48h = run_decide(NOW + timedelta(hours=48), [report], as_known(first))
-        self.assertEqual([n.kind for n in at_48h.notices], ["reminder"])
-
-        at_60h = run_decide(NOW + timedelta(hours=60), [report], as_known(at_48h))
-        self.assertEqual([n.kind for n in at_60h.notices], ["repeat"])
-
-    def test_old_report_seen_first_time_does_not_double_alert(self):
-        old = make_item(opened_at=NOW - timedelta(hours=72), reminder_after=timedelta(hours=48))
-        first = run_decide(NOW, [old], {})
-        self.assertEqual([n.kind for n in first.notices], ["new"])
-
-        second = run_decide(NOW + timedelta(hours=1), [old], as_known(first))
-        self.assertEqual(second.notices, [])
-
-    def test_cleared_item_sends_notice_and_closes(self):
-        first = run_decide(NOW, [make_item()], {})
-        gone = run_decide(NOW + timedelta(hours=1), [], as_known(first))
-        self.assertEqual([n.kind for n in gone.notices], ["cleared"])
-        self.assertFalse(gone.records[0].open)
-
-    def test_cleared_notice_can_be_disabled(self):
-        first = run_decide(NOW, [make_item()], {})
-        gone = run_decide(NOW + timedelta(hours=1), [], as_known(first), notify_cleared=False)
-        self.assertEqual(gone.notices, [])
-        self.assertFalse(gone.records[0].open)
-
-    def test_unchecked_source_is_not_closed(self):
-        first = run_decide(NOW, [make_item()], {})
-        skipped = run_decide(NOW + timedelta(hours=1), [], as_known(first), checked=set())
-        self.assertEqual(skipped.notices, [])
-        self.assertEqual(skipped.records, [])
-
-    def test_reopened_item_alerts_again(self):
-        closed = AlertRecord("registration:1", SOURCE, "x", NOW, NOW, False, False)
-        back = run_decide(NOW, [make_item()], {closed.key: closed})
-        self.assertEqual([n.kind for n in back.notices], ["new"])
-
-
-if __name__ == "__main__":
-    unittest.main()