fix(purge): short first tick on all three purge timers so daily-recycled nodes still purge

2026-07-09 09:26:42 -04:00
parent 7cd62933a6
commit b58d810dbe
5 changed files with 89 additions and 5 deletions
@@ -0,0 +1,40 @@
+using ZB.MOM.WW.ScadaBridge.Commons.Types;
+
+namespace ZB.MOM.WW.ScadaBridge.Commons.Tests.Types;
+
+/// <summary>
+/// Covers the shared purge-timer initial-delay rule (arch-review 04, S9): the
+/// three central purge singletons must NOT wait a full (up to 24 h) interval
+/// before their first tick, or a node recycled daily would never purge. The
+/// initial delay is min(interval, 5 min).
+/// </summary>
+public class PurgeTimerScheduleTests
+{
+    [Fact]
+    public void InitialDelay_LongInterval_IsCappedAtShortFirstTick()
+    {
+        // A daily (24 h) cadence must still fire its first purge within 5 minutes.
+        Assert.Equal(PurgeTimerSchedule.ShortFirstTick, PurgeTimerSchedule.InitialDelay(TimeSpan.FromHours(24)));
+    }
+
+    [Fact]
+    public void InitialDelay_IntervalShorterThanShortFirstTick_IsUnchanged()
+    {
+        // A millisecond test cadence must be preserved verbatim (min picks the interval),
+        // so the existing fast-tick actor suites keep their sub-second timing.
+        var fast = TimeSpan.FromMilliseconds(100);
+        Assert.Equal(fast, PurgeTimerSchedule.InitialDelay(fast));
+    }
+
+    [Fact]
+    public void InitialDelay_IntervalEqualToShortFirstTick_IsThatValue()
+    {
+        Assert.Equal(PurgeTimerSchedule.ShortFirstTick, PurgeTimerSchedule.InitialDelay(PurgeTimerSchedule.ShortFirstTick));
+    }
+
+    [Fact]
+    public void ShortFirstTick_IsFiveMinutes()
+    {
+        Assert.Equal(TimeSpan.FromMinutes(5), PurgeTimerSchedule.ShortFirstTick);
+    }
+}