Index: Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Read/Piping/PipingCalculationOutputEntityReadExtensionsTest.cs
===================================================================
diff -u -r3fb0df0ed6e64657154700ee7706e035d5bf99f5 -r5276b5e82afd56701abd55dd098651fb9ac504e2
--- Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Read/Piping/PipingCalculationOutputEntityReadExtensionsTest.cs	(.../PipingCalculationOutputEntityReadExtensionsTest.cs)	(revision 3fb0df0ed6e64657154700ee7706e035d5bf99f5)
+++ Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Read/Piping/PipingCalculationOutputEntityReadExtensionsTest.cs	(.../PipingCalculationOutputEntityReadExtensionsTest.cs)	(revision 5276b5e82afd56701abd55dd098651fb9ac504e2)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using Application.Ringtoets.Storage.DbContext;
 using Application.Ringtoets.Storage.Read.Piping;
 using NUnit.Framework;
@@ -30,6 +31,17 @@
     public class PipingCalculationOutputEntityReadExtensionsTest
     {
         [Test]
+        public void Read_EntityNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => ((PipingCalculationOutputEntity) null).Read();
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(call);
+            Assert.AreEqual("entity", exception.ParamName);
+        }
+
+        [Test]
         public void Read_ValidEntity_ReturnPipingOutput()
         {
             // Setup