Index: Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.Data.Test/GeneralClosingStructuresInputTest.cs
===================================================================
diff -u -re570ba372fafe1802a4caae2ef9410b64457198b -ra964168b91bc9c287adacc368480575f0bcf8cd9
--- Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.Data.Test/GeneralClosingStructuresInputTest.cs	(.../GeneralClosingStructuresInputTest.cs)	(revision e570ba372fafe1802a4caae2ef9410b64457198b)
+++ Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.Data.Test/GeneralClosingStructuresInputTest.cs	(.../GeneralClosingStructuresInputTest.cs)	(revision a964168b91bc9c287adacc368480575f0bcf8cd9)
@@ -19,7 +19,9 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using Core.Common.Base.Data;
+using Core.Common.TestUtil;
 using NUnit.Framework;
 using Ringtoets.Common.Data.Probabilistics;
 using Ringtoets.Common.Data.TestUtil;
@@ -76,8 +78,8 @@
 
         [Test]
         [TestCase(0, 1)]
-        [TestCase(3, 1.5)]
-        [TestCase(6, 3)]
+        [TestCase(8, 4)]
+        [TestCase(40, 20)]
         public void N_VariousValues_ReturnsExpectedValue(int n2A, double expected)
         {
             // Setup
@@ -93,6 +95,24 @@
             Assert.AreEqual(expected, n, n.GetAccuracy());
         }
 
+        [Test]
+        [TestCase(-456)]
+        [TestCase(-1)]
+        [TestCase(41)]
+        [TestCase(687)]
+        public void N2A_ValuesOutOfRange_ThrowArgumentOutOfRangeException(int invalidValue)
+        {
+            // Setup
+            var inputParameters = new GeneralClosingStructuresInput();
+
+            // Call
+            TestDelegate call = () => inputParameters.N2A = invalidValue;
+
+            // Assert
+            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentOutOfRangeException>(call,
+                                                                                                "De waarde voor 'N2A' moet in het bereik [0, 40] liggen.");
+        }
+
         private static void AssertAreEqual(double expected, RoundedDouble actual)
         {
             Assert.AreEqual(expected, actual, actual.GetAccuracy());