Index: Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/TreeNodeInfos/PipingFailureMechanismContextTreeNodeInfoTest.cs
===================================================================
diff -u -r171eda478707e1f059c568074c7be10ecc93abb8 -r3b1be2b494c30728564f41d6d8d14fc6a762957d
--- Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/TreeNodeInfos/PipingFailureMechanismContextTreeNodeInfoTest.cs	(.../PipingFailureMechanismContextTreeNodeInfoTest.cs)	(revision 171eda478707e1f059c568074c7be10ecc93abb8)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/TreeNodeInfos/PipingFailureMechanismContextTreeNodeInfoTest.cs	(.../PipingFailureMechanismContextTreeNodeInfoTest.cs)	(revision 3b1be2b494c30728564f41d6d8d14fc6a762957d)
@@ -662,7 +662,7 @@
                 failureMechanism.CalculationsGroup.Children.Add(validCalculation);
                 failureMechanism.CalculationsGroup.Children.Add(invalidCalculation);
 
-                var assessmentSection = mocks.Stub<IAssessmentSection>();
+                var assessmentSection = new ObservableTestAssessmentSectionStub();
                 var failureMechanismContext = new PipingFailureMechanismContext(failureMechanism, assessmentSection);
 
                 var menuBuilder = new CustomItemsOnlyContextMenuBuilder();