117 lines
4.3 KiB
C#
117 lines
4.3 KiB
C#
using Akka.Actor;
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using Akka.TestKit.Xunit2;
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using ScadaLink.AuditLog.Central;
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namespace ScadaLink.AuditLog.Tests.Central;
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/// <summary>
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/// Bundle E (M6-T7) tests for <see cref="SiteAuditTelemetryStalledTracker"/>.
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/// The tracker subscribes to the actor system's EventStream for
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/// <see cref="SiteAuditTelemetryStalledChanged"/> publications and maintains a
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/// per-site latch the central health surface can read. Since reconciliation is
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/// central-driven, the "stalled" state semantically belongs to central — not
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/// to the per-site <see cref="ScadaLink.Commons.Messages.Health.SiteHealthReport"/>
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/// payload (which the site itself emits). The tracker therefore lives as a
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/// central singleton, not on the site health collector.
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/// </summary>
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public class SiteAuditTelemetryStalledTrackerTests : TestKit
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{
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/// <summary>
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/// Helper: publishes a stalled-changed event on the actor system's
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/// EventStream and waits a moment for the tracker's subscribe callback to
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/// run. AwaitAssert avoids racing on the stream's async fan-out.
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/// </summary>
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private void PublishAndWait(SiteAuditTelemetryStalledTracker tracker, SiteAuditTelemetryStalledChanged evt)
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{
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Sys.EventStream.Publish(evt);
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AwaitAssert(
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() =>
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{
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var snapshot = tracker.Snapshot();
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Assert.True(snapshot.TryGetValue(evt.SiteId, out var stalled),
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$"tracker did not record event for {evt.SiteId}");
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Assert.Equal(evt.Stalled, stalled);
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},
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duration: TimeSpan.FromSeconds(2),
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interval: TimeSpan.FromMilliseconds(20));
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}
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[Fact]
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public void Initial_Snapshot_IsEmpty()
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{
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using var tracker = new SiteAuditTelemetryStalledTracker(Sys);
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var snapshot = tracker.Snapshot();
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Assert.Empty(snapshot);
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}
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[Fact]
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public void StalledTrue_Event_TrackerReports_Stalled()
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{
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using var tracker = new SiteAuditTelemetryStalledTracker(Sys);
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PublishAndWait(tracker, new SiteAuditTelemetryStalledChanged("siteA", Stalled: true));
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var snapshot = tracker.Snapshot();
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Assert.True(snapshot["siteA"]);
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}
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[Fact]
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public void StalledFalse_Event_TrackerReports_NotStalled()
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{
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using var tracker = new SiteAuditTelemetryStalledTracker(Sys);
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// First flip the site into stalled so the false transition has a
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// prior value to overwrite — mirrors how the reconciliation actor
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// only publishes false after a true.
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PublishAndWait(tracker, new SiteAuditTelemetryStalledChanged("siteA", Stalled: true));
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PublishAndWait(tracker, new SiteAuditTelemetryStalledChanged("siteA", Stalled: false));
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var snapshot = tracker.Snapshot();
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Assert.False(snapshot["siteA"]);
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}
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[Fact]
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public void Multiple_Sites_Tracked_Independently()
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{
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using var tracker = new SiteAuditTelemetryStalledTracker(Sys);
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PublishAndWait(tracker, new SiteAuditTelemetryStalledChanged("siteA", Stalled: true));
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PublishAndWait(tracker, new SiteAuditTelemetryStalledChanged("siteB", Stalled: false));
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PublishAndWait(tracker, new SiteAuditTelemetryStalledChanged("siteC", Stalled: true));
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var snapshot = tracker.Snapshot();
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Assert.Equal(3, snapshot.Count);
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Assert.True(snapshot["siteA"]);
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Assert.False(snapshot["siteB"]);
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Assert.True(snapshot["siteC"]);
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}
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[Fact]
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public void Constructor_With_Null_ActorSystem_Throws()
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{
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Assert.Throws<ArgumentNullException>(
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() => new SiteAuditTelemetryStalledTracker((ActorSystem)null!));
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}
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[Fact]
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public void Dispose_Unsubscribes_From_EventStream()
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{
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var tracker = new SiteAuditTelemetryStalledTracker(Sys);
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PublishAndWait(tracker, new SiteAuditTelemetryStalledChanged("siteA", Stalled: true));
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tracker.Dispose();
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// After dispose any further events are ignored — the snapshot
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// reflects the last known state at dispose time.
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Sys.EventStream.Publish(new SiteAuditTelemetryStalledChanged("siteA", Stalled: false));
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// Give the stream a moment in case the unsubscribe is racey; the
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// assertion is that siteA stays at true.
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Thread.Sleep(50);
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Assert.True(tracker.Snapshot()["siteA"]);
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}
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}
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