Index: Ringtoets/HeightStructures/test/Ringtoets.HeightStructures.Service.Test/HeightStructuresCalculationServiceTest.cs
===================================================================
diff -u -r00a81cf63e2bee520315ebd8ce9795d0920a97da -r1a6804681b0758a5761e39099e4b6de65f9cf4a2
--- Ringtoets/HeightStructures/test/Ringtoets.HeightStructures.Service.Test/HeightStructuresCalculationServiceTest.cs	(.../HeightStructuresCalculationServiceTest.cs)	(revision 00a81cf63e2bee520315ebd8ce9795d0920a97da)
+++ Ringtoets/HeightStructures/test/Ringtoets.HeightStructures.Service.Test/HeightStructuresCalculationServiceTest.cs	(.../HeightStructuresCalculationServiceTest.cs)	(revision 1a6804681b0758a5761e39099e4b6de65f9cf4a2)
@@ -167,10 +167,7 @@
         }
 
         [Test]
-        [TestCase(double.NaN)]
-        [TestCase(double.NegativeInfinity)]
-        [TestCase(double.PositiveInfinity)]
-        public void Validate_DeviationWaveDirectionInvalid_ReturnsFalse(double value)
+        public void Validate_DeviationWaveDirectionInvalid_ReturnsFalse()
         {
             // Setup
             var mockRepository = new MockRepository();
@@ -181,7 +178,7 @@
 
             const string name = "<very nice name>";
             const string parameterName = "afwijking golfrichting";
-            string expectedValidationMessage = string.Format("Validatie mislukt: De waarde voor '{0}' moet een geldig getal zijn.", parameterName);
+            string expectedValidationMessage = string.Format("Validatie mislukt: Er is geen concreet getal ingevoerd voor '{0}'.", parameterName);
 
             var calculation = new TestHeightStructuresCalculation()
             {
@@ -193,7 +190,7 @@
                 }
             };
 
-            calculation.InputParameters.DeviationWaveDirection = (RoundedDouble) value;
+            calculation.InputParameters.DeviationWaveDirection = (RoundedDouble) double.NaN;
 
             // Call
             bool isValid = false;