From 7f535c0e9df80c76b4f1e78d899803691f1a4cf5 Mon Sep 17 00:00:00 2001
From: Joseph Doherty <dohejw01@gmail.com>
Date: Thu, 11 Jun 2026 13:24:46 -0400
Subject: [PATCH] test(historian): cover non-positive DeadLetterRetentionDays
 validation warning

---
 .../Historian/AlarmHistorianRegistrationTests.cs           | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/Historian/AlarmHistorianRegistrationTests.cs b/tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/Historian/AlarmHistorianRegistrationTests.cs
index de3b44a2..0d8db9a1 100644
--- a/tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/Historian/AlarmHistorianRegistrationTests.cs
+++ b/tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/Historian/AlarmHistorianRegistrationTests.cs
@@ -152,6 +152,13 @@ public sealed class AlarmHistorianRegistrationTests
         opts.Validate().ShouldContain(w => w.Contains("Capacity"));
     }
 
+    [Fact]
+    public void Validate_warns_on_non_positive_retention()
+    {
+        var opts = new AlarmHistorianOptions { Enabled = true, SharedSecret = "s", DatabasePath = "/abs/h.db", DeadLetterRetentionDays = 0 };
+        opts.Validate().ShouldContain(w => w.Contains("DeadLetterRetentionDays"));
+    }
+
     [Fact]
     public void Validate_accumulates_multiple_warnings()
     {