Index: Ringtoets/Piping/test/Ringtoets.Piping.Service.Test/PipingDataSynchronizationServiceTest.cs
===================================================================
diff -u -r8723c31042f8aa4174e6d51a42f20d3665ec2da0 -re82f04fb50a7b5a6f9c45289258c00c94aa8c64c
--- Ringtoets/Piping/test/Ringtoets.Piping.Service.Test/PipingDataSynchronizationServiceTest.cs	(.../PipingDataSynchronizationServiceTest.cs)	(revision 8723c31042f8aa4174e6d51a42f20d3665ec2da0)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Service.Test/PipingDataSynchronizationServiceTest.cs	(.../PipingDataSynchronizationServiceTest.cs)	(revision e82f04fb50a7b5a6f9c45289258c00c94aa8c64c)
@@ -79,8 +79,9 @@
         {
             // Setup
             PipingFailureMechanism failureMechanism = CreateFullyConfiguredFailureMechanism();
-            var expectedAffectedCalculations = failureMechanism.Calculations.Where(c => c.HasOutput)
-                                                               .ToArray();
+            ICalculation[] expectedAffectedCalculations = failureMechanism.Calculations
+                                                                          .Where(c => c.HasOutput)
+                                                                          .ToArray();
 
             // Call
             IEnumerable<PipingCalculation> affectedItems = PipingDataSynchronizationService.ClearAllCalculationOutput(failureMechanism);
@@ -106,9 +107,9 @@
         {
             // Setup
             PipingFailureMechanism failureMechanism = CreateFullyConfiguredFailureMechanism();
-            var expectedAffectedCalculations = failureMechanism.Calculations.Cast<PipingCalculation>()
-                                                               .Where(c => c.InputParameters.HydraulicBoundaryLocation != null || c.HasOutput)
-                                                               .ToArray();
+            PipingCalculation[] expectedAffectedCalculations = failureMechanism.Calculations.Cast<PipingCalculation>()
+                                                                               .Where(c => c.InputParameters.HydraulicBoundaryLocation != null || c.HasOutput)
+                                                                               .ToArray();
 
             // Call
             IEnumerable<PipingCalculation> affectedItems = PipingDataSynchronizationService.ClearAllCalculationOutputAndHydraulicBoundaryLocations(failureMechanism);
@@ -174,14 +175,17 @@
             failureMechanism.CalculationsGroup.Children.Add(calculationWithOutput);
             failureMechanism.CalculationsGroup.Children.Add(calculationWithOutputAndHydraulicBoundaryLocation);
             failureMechanism.CalculationsGroup.Children.Add(calculationWithHydraulicBoundaryLocation);
+            failureMechanism.CalculationsGroup.Children.Add(new CalculationGroup
+            {
+                Children =
+                {
+                    subCalculation,
+                    subCalculationWithOutput,
+                    subCalculationWithOutputAndHydraulicBoundaryLocation,
+                    subCalculationWithHydraulicBoundaryLocation
+                }
+            });
 
-            var calculationGroup = new CalculationGroup();
-            calculationGroup.Children.Add(subCalculation);
-            calculationGroup.Children.Add(subCalculationWithOutput);
-            calculationGroup.Children.Add(subCalculationWithOutputAndHydraulicBoundaryLocation);
-            calculationGroup.Children.Add(subCalculationWithHydraulicBoundaryLocation);
-            failureMechanism.CalculationsGroup.Children.Add(calculationGroup);
-
             return failureMechanism;
         }
     }