From b89f2266eca8939b1b7a0b75bab4009ed76a5d27 Mon Sep 17 00:00:00 2001
From: Ruairidh MacLeod <ruairidh@rkm.dev>
Date: Thu, 3 Oct 2024 09:38:01 +0100
Subject: [PATCH] add test for unset MessageHeader.CurrentProgramName

---
 .../Common/Messages/MessageHeaderTest.cs                 | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tests/SmiServices.UnitTests/Common/Messages/MessageHeaderTest.cs b/tests/SmiServices.UnitTests/Common/Messages/MessageHeaderTest.cs
index e0994f60e..ac051e40d 100644
--- a/tests/SmiServices.UnitTests/Common/Messages/MessageHeaderTest.cs
+++ b/tests/SmiServices.UnitTests/Common/Messages/MessageHeaderTest.cs
@@ -75,5 +75,14 @@ public void TestMessageHeader_GetHashCode()
             Assert.That(h2, Is.EqualTo(h1));
             Assert.That(h2.GetHashCode(), Is.EqualTo(h1.GetHashCode()));
         }
+
+        [Test]
+        public void CurrentProgramName_Unset_ThrowsException()
+        {
+            MessageHeader.CurrentProgramName = null!;
+
+            var exc = Assert.Throws<Exception>(() => new MessageHeader());
+            Assert.That(exc.Message, Is.EqualTo("Value must be set before use"));
+        }
     }
 }