Index: Ringtoets/Common/test/Ringtoets.Common.IO.TestUtil/CustomCalculationConfigurationWriterDesignGuidelinesTestFixture.cs
===================================================================
diff -u -re507c88f2863ff7bc93505caf71c5f8025fb48c0 -r3a60f4df420a7669a047880a924bf4a0ff67c265
--- Ringtoets/Common/test/Ringtoets.Common.IO.TestUtil/CustomCalculationConfigurationWriterDesignGuidelinesTestFixture.cs	(.../CustomCalculationConfigurationWriterDesignGuidelinesTestFixture.cs)	(revision e507c88f2863ff7bc93505caf71c5f8025fb48c0)
+++ Ringtoets/Common/test/Ringtoets.Common.IO.TestUtil/CustomCalculationConfigurationWriterDesignGuidelinesTestFixture.cs	(.../CustomCalculationConfigurationWriterDesignGuidelinesTestFixture.cs)	(revision 3a60f4df420a7669a047880a924bf4a0ff67c265)
@@ -180,7 +180,7 @@
         protected virtual void AssertNullConfiguration(ArgumentNullException exception)
         {
             Assert.IsNotNull(exception);
-            Assert.AreEqual("configuration", exception.ParamName);
+            Assert.AreEqual("configurations", exception.ParamName);
         }
 
         protected virtual void AssertNullFilePath(ArgumentException exception)