Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/DerivedPipingInputTest.cs
===================================================================
diff -u -r6744bc3cd2ffd54b89e8ee19c2953059ae698e80 -rce31448a066c084f755439f3e7d453bfb042b291
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/DerivedPipingInputTest.cs	(.../DerivedPipingInputTest.cs)	(revision 6744bc3cd2ffd54b89e8ee19c2953059ae698e80)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/DerivedPipingInputTest.cs	(.../DerivedPipingInputTest.cs)	(revision ce31448a066c084f755439f3e7d453bfb042b291)
@@ -44,7 +44,8 @@
             TestDelegate call = () => new DerivedPipingInput(null);
 
             // Assert
-            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentNullException>(call, "Cannot create DerivedPipingInput without PipingInput.");
+            const string expectedMessage = "Cannot create DerivedPipingInput without PipingInput.";
+            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentNullException>(call, expectedMessage);
         }
 
         [Test]