Index: Ringtoets/Common/test/Ringtoets.Common.Forms.Test/TreeNodeInfos/RingtoetsTreeNodeInfoFactoryTest.cs
===================================================================
diff -u -r36b6f1f7c1ddf585689512eb61256d41a1e0ca64 -r0a94ed42cb943659d68be2ce6fb430f8f29fc3f3
--- Ringtoets/Common/test/Ringtoets.Common.Forms.Test/TreeNodeInfos/RingtoetsTreeNodeInfoFactoryTest.cs	(.../RingtoetsTreeNodeInfoFactoryTest.cs)	(revision 36b6f1f7c1ddf585689512eb61256d41a1e0ca64)
+++ Ringtoets/Common/test/Ringtoets.Common.Forms.Test/TreeNodeInfos/RingtoetsTreeNodeInfoFactoryTest.cs	(.../RingtoetsTreeNodeInfoFactoryTest.cs)	(revision 0a94ed42cb943659d68be2ce6fb430f8f29fc3f3)
@@ -1111,6 +1111,11 @@
             {
                 return null;
             }
+
+            public ICalculationOutput GetObservableOutput()
+            {
+                return null;
+            }
         }
 
         private class TestFailureMechanismContext : FailureMechanismContext<IFailureMechanism>