Index: Ringtoets/HydraRing/test/Ringtoets.HydraRing.Calculation.TestUtil.Test/TestHydraRingCalculationServiceTest.cs
===================================================================
diff -u -rfb6c8cb473282ccd9b920afddb33a2284c7274cd -r2973c5f790a5131e427bd5f73e2a620044199639
--- Ringtoets/HydraRing/test/Ringtoets.HydraRing.Calculation.TestUtil.Test/TestHydraRingCalculationServiceTest.cs	(.../TestHydraRingCalculationServiceTest.cs)	(revision fb6c8cb473282ccd9b920afddb33a2284c7274cd)
+++ Ringtoets/HydraRing/test/Ringtoets.HydraRing.Calculation.TestUtil.Test/TestHydraRingCalculationServiceTest.cs	(.../TestHydraRingCalculationServiceTest.cs)	(revision 2973c5f790a5131e427bd5f73e2a620044199639)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using NUnit.Framework;
 using Ringtoets.HydraRing.Calculation.Data;
 using Ringtoets.HydraRing.Calculation.Data.Input;
@@ -79,31 +80,31 @@
             {
                 get
                 {
-                    throw new System.NotImplementedException();
+                    throw new NotImplementedException();
                 }
             }
 
             public override int CalculationTypeId
             {
                 get
                 {
-                    throw new System.NotImplementedException();
+                    throw new NotImplementedException();
                 }
             }
 
             public override int VariableId
             {
                 get
                 {
-                    throw new System.NotImplementedException();
+                    throw new NotImplementedException();
                 }
             }
 
             public override HydraRingSection Section
             {
                 get
                 {
-                    throw new System.NotImplementedException();
+                    throw new NotImplementedException();
                 }
             }
         }