Index: Ringtoets/WaveImpactAsphaltCover/test/Ringtoets.WaveImpactAsphaltCover.Plugin.Test/TreeNodeInfos/WaveImpactAsphaltCoverFailureMechanismContextTreeNodeInfoTest.cs
===================================================================
diff -u -rc0d93bd3f90940662535cb59061c59549554f5d1 -rf8f4f06311e58fd749631bdb933d8f8468ce56f8
--- Ringtoets/WaveImpactAsphaltCover/test/Ringtoets.WaveImpactAsphaltCover.Plugin.Test/TreeNodeInfos/WaveImpactAsphaltCoverFailureMechanismContextTreeNodeInfoTest.cs	(.../WaveImpactAsphaltCoverFailureMechanismContextTreeNodeInfoTest.cs)	(revision c0d93bd3f90940662535cb59061c59549554f5d1)
+++ Ringtoets/WaveImpactAsphaltCover/test/Ringtoets.WaveImpactAsphaltCover.Plugin.Test/TreeNodeInfos/WaveImpactAsphaltCoverFailureMechanismContextTreeNodeInfoTest.cs	(.../WaveImpactAsphaltCoverFailureMechanismContextTreeNodeInfoTest.cs)	(revision f8f4f06311e58fd749631bdb933d8f8468ce56f8)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System.Collections.Generic;
 using System.Drawing;
 using System.IO;
 using System.Linq;
@@ -522,13 +523,12 @@
             var failureMechanism = new WaveImpactAsphaltCoverFailureMechanism();
             IAssessmentSection assessmentSection = CreateAssessmentSectionWithHydraulicBoundaryOutput();
 
-            var group = new CalculationGroup();
             HydraulicBoundaryLocation hydraulicBoundaryLocation = assessmentSection.HydraulicBoundaryDatabase.Locations.First();
             WaveImpactAsphaltCoverWaveConditionsCalculation calculationA = GetValidCalculation(hydraulicBoundaryLocation);
             WaveImpactAsphaltCoverWaveConditionsCalculation calculationB = GetValidCalculation(hydraulicBoundaryLocation);
-            group.Children.Add(calculationA);
-            group.Children.Add(calculationB);
-            failureMechanism.WaveConditionsCalculationGroup.Children.Add(group);
+            List<ICalculationBase> calculations = failureMechanism.WaveConditionsCalculationGroup.Children;
+            calculations.Add(calculationA);
+            calculations.Add(calculationB);
 
             var nodeData = new WaveImpactAsphaltCoverFailureMechanismContext(failureMechanism,
                                                                              assessmentSection);