Index: Ringtoets/Common/test/Ringtoets.Common.Service.Test/TargetProbabilityCalculationServiceHelperTest.cs
===================================================================
diff -u -rd4d68b519b90ce17bcfa75b0acc970c45a12fecf -r601f1061f518bafdba6041148f637b72338c0e74
--- Ringtoets/Common/test/Ringtoets.Common.Service.Test/TargetProbabilityCalculationServiceHelperTest.cs	(.../TargetProbabilityCalculationServiceHelperTest.cs)	(revision d4d68b519b90ce17bcfa75b0acc970c45a12fecf)
+++ Ringtoets/Common/test/Ringtoets.Common.Service.Test/TargetProbabilityCalculationServiceHelperTest.cs	(.../TargetProbabilityCalculationServiceHelperTest.cs)	(revision 601f1061f518bafdba6041148f637b72338c0e74)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using NUnit.Framework;
 
 namespace Ringtoets.Common.Service.Test
@@ -57,6 +58,17 @@
         }
 
         [Test]
+        public void ValidateTargetProbability_HandleLogMessageActionNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate test = () => TargetProbabilityCalculationServiceHelper.ValidateTargetProbability(0.005, null);
+
+            // Assert
+            string parameter = Assert.Throws<ArgumentNullException>(test).ParamName;
+            Assert.AreEqual("handleLogMessageAction", parameter);
+        }
+
+        [Test]
         public void ValidateTargetProbability_ValidTargetProbability_ReturnsTrueAndHandlesNoLogMessage()
         {
             // Setup