Index: Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Forms.Test/DuneErosionFailureMechanismPropertyChangeHandlerTest.cs
===================================================================
diff -u -r35e9b5c4aee3c7d5b9fa31b6632678acfce97a86 -re57e79927485e44d681b0617f17bada42dbfb862
--- Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Forms.Test/DuneErosionFailureMechanismPropertyChangeHandlerTest.cs	(.../DuneErosionFailureMechanismPropertyChangeHandlerTest.cs)	(revision 35e9b5c4aee3c7d5b9fa31b6632678acfce97a86)
+++ Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Forms.Test/DuneErosionFailureMechanismPropertyChangeHandlerTest.cs	(.../DuneErosionFailureMechanismPropertyChangeHandlerTest.cs)	(revision e57e79927485e44d681b0617f17bada42dbfb862)
@@ -107,7 +107,7 @@
             }
 
             var failureMechanism = new DuneErosionFailureMechanism();
-            failureMechanism.DuneLocations.AddRange(testCase.Locations);
+            failureMechanism.SetDuneLocations(testCase.Locations);
 
             var propertySet = 0;
 
@@ -202,8 +202,11 @@
             };
 
             var failureMechanism = new DuneErosionFailureMechanism();
-            failureMechanism.DuneLocations.Add(CreateDuneLocationWithoutOutput());
-            failureMechanism.DuneLocations.Add(CreateDuneLocationWithOutput());
+            failureMechanism.SetDuneLocations(new[]
+            {
+                CreateDuneLocationWithoutOutput(),
+                CreateDuneLocationWithOutput()
+            });
 
             var propertySet = 0;
 
@@ -313,8 +316,6 @@
             {
                 new TestDuneLocation()
             };
-
-            failureMechanism.DuneLocations.AddRange(duneLocations);
             failureMechanism.SetDuneLocations(duneLocations);
         }