fix(scripted-alarms): resolve Medium code-review finding (Core.ScriptedAlarms-012)
Add engine-level tests covering the six gaps identified in the finding:
(1) timed-shelve auto-expiry driven via injectable clock + RunShelvingCheckForTest
hook so timer tests are deterministic;
(2) ConfirmAsync, TimedShelveAsync/UnshelveAsync round-trip, EnableAsync engine
methods exercised end-to-end;
(3) OnEvent subscriber-throws isolation — engine state advances and stays
operational after a subscriber throws;
(4) IAlarmStateStore.SaveAsync failure leaves in-memory state unchanged (locks in
the persist-before-update invariant from finding-007);
(5) second LoadAsync does not leak the old timer (regression for finding-002);
(6) AreInputsReady cold-start guard correctly blocks on Bad/missing inputs and
allows Uncertain-quality inputs through.
Expose RunShelvingCheckForTest() internal method on ScriptedAlarmEngine to
support deterministic timer tests.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Joseph Doherty
@@ -364,6 +364,248 @@ public sealed class ScriptedAlarmEngineTests
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"concurrent reads of _alarms while it is being mutated must not throw");
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}
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// -------------------------------------------------------------------------
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// Core.ScriptedAlarms-012: coverage gaps
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// -------------------------------------------------------------------------
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// (1) Timed-shelve auto-expiry driven by the engine's shelving timer via an
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// injectable clock — the clock and scriptTimeout constructor parameters
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// exist for exactly this.
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[Fact]
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public async Task TimedShelve_auto_expires_when_engine_shelving_check_runs(/* -012 (1) */)
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{
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// Use a controllable clock; start it at T0 so we can advance it manually.
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var now = new DateTime(2026, 1, 1, 12, 0, 0, DateTimeKind.Utc);
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Func<DateTime> clock = () => now;
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var up = new FakeUpstream();
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up.Set("Temp", 50);
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var logger = new LoggerConfiguration().CreateLogger();
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var store = new InMemoryAlarmStateStore();
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using var eng = new ScriptedAlarmEngine(up, store, new ScriptLoggerFactory(logger), logger, clock);
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await eng.LoadAsync([Alarm("HighTemp", """return (int)ctx.GetTag("Temp").Value > 100;""")],
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TestContext.Current.CancellationToken);
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// Shelve for 10 minutes from now.
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var unshelveAt = now.AddMinutes(10);
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await eng.TimedShelveAsync("HighTemp", "alice", unshelveAt, TestContext.Current.CancellationToken);
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eng.GetState("HighTemp")!.Shelving.Kind.ShouldBe(ShelvingKind.Timed);
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var events = new List<ScriptedAlarmEvent>();
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eng.OnEvent += (_, e) => events.Add(e);
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// Advance clock past the unshelve time and invoke RunShelvingCheck directly
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// (the 5-second real timer would be non-deterministic in tests).
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now = now.AddMinutes(11);
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eng.RunShelvingCheckForTest();
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await WaitForAsync(() => eng.GetState("HighTemp")!.Shelving.Kind == ShelvingKind.Unshelved);
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eng.GetState("HighTemp")!.Shelving.Kind.ShouldBe(ShelvingKind.Unshelved, "timed shelve expired");
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events.Any(e => e.Emission == EmissionKind.Unshelved).ShouldBeTrue("Unshelved event emitted");
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}
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// (2a) ConfirmAsync end-to-end through the engine.
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[Fact]
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public async Task ConfirmAsync_records_user_and_emits_Confirmed(/* -012 (2) */)
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{
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var up = new FakeUpstream();
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up.Set("Temp", 150);
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using var eng = Build(up, out var store);
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await eng.LoadAsync([Alarm("A", """return (int)ctx.GetTag("Temp").Value > 100;""")],
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TestContext.Current.CancellationToken);
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// activate → ack → clear → confirm
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await eng.AcknowledgeAsync("A", "alice", null, TestContext.Current.CancellationToken);
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up.Push("Temp", 50);
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await WaitForAsync(() => eng.GetState("A")!.Active == AlarmActiveState.Inactive);
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var events = new List<ScriptedAlarmEvent>();
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eng.OnEvent += (_, e) => events.Add(e);
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await eng.ConfirmAsync("A", "bob", "resolved", TestContext.Current.CancellationToken);
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eng.GetState("A")!.Confirmed.ShouldBe(AlarmConfirmedState.Confirmed);
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eng.GetState("A")!.LastConfirmUser.ShouldBe("bob");
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events.Any(e => e.Emission == EmissionKind.Confirmed).ShouldBeTrue();
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var persisted = await store.LoadAsync("A", TestContext.Current.CancellationToken);
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persisted!.Confirmed.ShouldBe(AlarmConfirmedState.Confirmed);
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}
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// (2b) TimedShelveAsync / UnshelveAsync end-to-end through the engine.
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[Fact]
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public async Task TimedShelveAsync_and_UnshelveAsync_round_trip(/* -012 (2) */)
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{
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var now = new DateTime(2026, 1, 1, 12, 0, 0, DateTimeKind.Utc);
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Func<DateTime> clock = () => now;
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var up = new FakeUpstream();
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up.Set("Temp", 50);
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var logger = new LoggerConfiguration().CreateLogger();
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using var eng = new ScriptedAlarmEngine(up, new InMemoryAlarmStateStore(),
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new ScriptLoggerFactory(logger), logger, clock);
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await eng.LoadAsync([Alarm("A", "return false;")], TestContext.Current.CancellationToken);
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var unshelveAt = now.AddMinutes(30);
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await eng.TimedShelveAsync("A", "alice", unshelveAt, TestContext.Current.CancellationToken);
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eng.GetState("A")!.Shelving.Kind.ShouldBe(ShelvingKind.Timed);
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eng.GetState("A")!.Shelving.UnshelveAtUtc.ShouldBe(unshelveAt);
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// Operator unshelves manually before the timer expires.
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var events = new List<ScriptedAlarmEvent>();
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eng.OnEvent += (_, e) => events.Add(e);
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await eng.UnshelveAsync("A", "bob", TestContext.Current.CancellationToken);
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eng.GetState("A")!.Shelving.Kind.ShouldBe(ShelvingKind.Unshelved);
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events.Any(e => e.Emission == EmissionKind.Unshelved).ShouldBeTrue();
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}
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// (2c) EnableAsync end-to-end through the engine.
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[Fact]
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public async Task EnableAsync_re_enables_after_disable(/* -012 (2) */)
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{
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var up = new FakeUpstream();
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up.Set("Temp", 50);
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using var eng = Build(up, out _);
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await eng.LoadAsync([Alarm("A", """return (int)ctx.GetTag("Temp").Value > 100;""")],
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TestContext.Current.CancellationToken);
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await eng.DisableAsync("A", "alice", TestContext.Current.CancellationToken);
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eng.GetState("A")!.Enabled.ShouldBe(AlarmEnabledState.Disabled);
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var events = new List<ScriptedAlarmEvent>();
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eng.OnEvent += (_, e) => events.Add(e);
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await eng.EnableAsync("A", "bob", TestContext.Current.CancellationToken);
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eng.GetState("A")!.Enabled.ShouldBe(AlarmEnabledState.Enabled);
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events.Any(e => e.Emission == EmissionKind.Enabled).ShouldBeTrue();
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}
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// (3) OnEvent subscriber-throws isolation — a bad subscriber must not crash
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// the engine or prevent subsequent alarm state transitions. The engine logs
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// the exception and continues operating; any later alarm changes still work.
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[Fact]
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public async Task OnEvent_subscriber_exception_does_not_crash_engine(/* -012 (3) */)
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{
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var up = new FakeUpstream();
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up.Set("Temp", 50);
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using var eng = Build(up, out _);
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await eng.LoadAsync([Alarm("A", """return (int)ctx.GetTag("Temp").Value > 100;""")],
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TestContext.Current.CancellationToken);
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// Single subscriber that always throws.
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eng.OnEvent += (_, _) => throw new InvalidOperationException("bad subscriber");
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// The engine must not throw or get stuck when the subscriber throws.
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// Up.Push triggers ReevaluateAsync → EvaluatePredicateToStateAsync → EmitEvent.
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up.Push("Temp", 150);
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// Wait for the engine to process the push (it will try+catch the subscriber
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// throw and continue). State must advance even though the subscriber blew up.
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await WaitForAsync(() => eng.GetState("A")!.Active == AlarmActiveState.Active);
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eng.GetState("A")!.Active.ShouldBe(AlarmActiveState.Active,
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"engine state advances even when the OnEvent subscriber threw");
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// Verify the engine is still operational: a second state change must work.
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up.Push("Temp", 50);
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await WaitForAsync(() => eng.GetState("A")!.Active == AlarmActiveState.Inactive);
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eng.GetState("A")!.Active.ShouldBe(AlarmActiveState.Inactive,
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"engine keeps processing after subscriber exception");
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}
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// (4) IAlarmStateStore.SaveAsync failure — in-memory state must remain at the
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// prior value after finding -007 fix (persist-before-update).
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[Fact]
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public async Task Store_save_failure_leaves_in_memory_state_unchanged(/* -012 (4) */)
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{
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var up = new FakeUpstream();
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up.Set("Temp", 150);
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var logger = new LoggerConfiguration().CreateLogger();
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var failingStore = new FailOnSaveAlarmStateStore();
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using var eng = new ScriptedAlarmEngine(up, failingStore, new ScriptLoggerFactory(logger), logger);
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// LoadAsync seeds + persists startup state — make it succeed for now.
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failingStore.FailSave = false;
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await eng.LoadAsync([Alarm("A", """return (int)ctx.GetTag("Temp").Value > 100;""")],
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TestContext.Current.CancellationToken);
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// Startup evaluation activated the alarm.
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eng.GetState("A")!.Active.ShouldBe(AlarmActiveState.Active);
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// Now make every save throw.
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failingStore.FailSave = true;
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// Try to acknowledge — the save will fail, so the in-memory ack state must
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// remain Unacknowledged (persist-before-update: -007 fix).
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await Should.ThrowAsync<InvalidOperationException>(
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() => eng.AcknowledgeAsync("A", "alice", null, TestContext.Current.CancellationToken));
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eng.GetState("A")!.Acked.ShouldBe(AlarmAckedState.Unacknowledged,
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"in-memory state must stay at prior value when store save fails");
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}
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// (5) Re-entrant LoadAsync — the old timer must not keep firing after a second
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// call (regression for finding -002: _shelvingTimer?.Dispose() fix).
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[Fact]
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public async Task Second_LoadAsync_does_not_leak_old_timer(/* -012 (5) */)
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{
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// Use a clock whose invocation count we can observe indirectly through
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// shelving-check side effects: if the old timer leaked it would call
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// RunShelvingCheck an additional time, but we assert no double-disposal
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// or double-subscriptions instead.
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var up = new FakeUpstream();
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up.Set("Temp", 50);
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using var eng = Build(up, out _);
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await eng.LoadAsync([Alarm("A", """return (int)ctx.GetTag("Temp").Value > 100;""")],
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TestContext.Current.CancellationToken);
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var subsAfterFirst = up.ActiveSubscriptionCount;
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// Second load with a different alarm definition set.
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await eng.LoadAsync([Alarm("B", """return (int)ctx.GetTag("Temp").Value > 200;""")],
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TestContext.Current.CancellationToken);
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// After reload, only "B" should be present; "A" subscriptions released.
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eng.LoadedAlarmIds.ShouldContain("B");
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eng.LoadedAlarmIds.ShouldNotContain("A");
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// Subscriptions should match the new set only (one path "Temp" → 1 sub).
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up.ActiveSubscriptionCount.ShouldBe(subsAfterFirst, "subscription count same after reload on same path");
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// Engine is still functional.
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up.Push("Temp", 250);
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await WaitForAsync(() => eng.GetState("B")!.Active == AlarmActiveState.Active);
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}
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// (6) Cold-start AreInputsReady guard — null value, Bad status, and Uncertain
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// status inputs are all handled correctly.
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[Fact]
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public async Task AreInputsReady_blocks_evaluation_for_null_and_bad_inputs(/* -012 (6) */)
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{
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var up = new FakeUpstream();
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// "Temp" is missing entirely (ReadTag returns BadNodeIdUnknown).
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using var eng = Build(up, out _);
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await eng.LoadAsync([Alarm("A", """return (int)ctx.GetTag("Temp").Value > 100;""")],
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TestContext.Current.CancellationToken);
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// No tag value → bad status → AreInputsReady returns false → stays Inactive.
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eng.GetState("A")!.Active.ShouldBe(AlarmActiveState.Inactive,
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"predicate not evaluated when input has Bad status");
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// Now provide a bad-quality value explicitly.
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up.Set("Temp", 150, statusCode: 0x80000000u); // Bad severity bit
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up.Push("Temp", 150, statusCode: 0x80000000u);
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await Task.Delay(100, TestContext.Current.CancellationToken);
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eng.GetState("A")!.Active.ShouldBe(AlarmActiveState.Inactive,
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"predicate not evaluated when input has explicit Bad status code");
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// Uncertain quality (non-zero but bit 31 clear) — should be treated as ready.
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// The alarm should activate when the value is above 100 with Uncertain quality.
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up.Set("Temp", 150, statusCode: 0x40000000u); // Uncertain severity
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up.Push("Temp", 150, statusCode: 0x40000000u);
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await WaitForAsync(() => eng.GetState("A")!.Active == AlarmActiveState.Active);
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eng.GetState("A")!.Active.ShouldBe(AlarmActiveState.Active,
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"Uncertain-quality inputs are treated as ready — predicate evaluates");
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}
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private static async Task WaitForAsync(Func<bool> cond, int timeoutMs = 2000)
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{
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var deadline = DateTime.UtcNow.AddMilliseconds(timeoutMs);
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@@ -374,4 +616,33 @@ public sealed class ScriptedAlarmEngineTests
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}
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throw new TimeoutException("Condition did not become true in time");
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}
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// -------------------------------------------------------------------------
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// Test helpers
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// -------------------------------------------------------------------------
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/// <summary>
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/// A store that can be instructed to throw on every SaveAsync call.
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/// Used to exercise the persist-before-update invariant (finding -007).
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/// </summary>
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private sealed class FailOnSaveAlarmStateStore : IAlarmStateStore
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{
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private readonly InMemoryAlarmStateStore _inner = new();
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public bool FailSave { get; set; }
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public Task<AlarmConditionState?> LoadAsync(string alarmId, CancellationToken ct)
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=> _inner.LoadAsync(alarmId, ct);
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public Task<IReadOnlyList<AlarmConditionState>> LoadAllAsync(CancellationToken ct)
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=> _inner.LoadAllAsync(ct);
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public Task SaveAsync(AlarmConditionState state, CancellationToken ct)
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{
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if (FailSave) throw new InvalidOperationException("Simulated store failure");
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return _inner.SaveAsync(state, ct);
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}
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public Task RemoveAsync(string alarmId, CancellationToken ct)
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=> _inner.RemoveAsync(alarmId, ct);
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}
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}
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