Index: Application/Ringtoets/test/Application.Ringtoets.Storage.TestUtil/RingtoetsProjectTestHelper.cs
===================================================================
diff -u -r649b0974fb71df7368d19682bc255618f44d49c1 -re57e79927485e44d681b0617f17bada42dbfb862
--- Application/Ringtoets/test/Application.Ringtoets.Storage.TestUtil/RingtoetsProjectTestHelper.cs	(.../RingtoetsProjectTestHelper.cs)	(revision 649b0974fb71df7368d19682bc255618f44d49c1)
+++ Application/Ringtoets/test/Application.Ringtoets.Storage.TestUtil/RingtoetsProjectTestHelper.cs	(.../RingtoetsProjectTestHelper.cs)	(revision e57e79927485e44d681b0617f17bada42dbfb862)
@@ -863,9 +863,12 @@
                 }
             };
 
-            failureMechanism.DuneLocations.Add(locationWithoutOutput);
-            failureMechanism.DuneLocations.Add(locationWithOutput);
-            failureMechanism.DuneLocations.Add(locationCalculated);
+            failureMechanism.SetDuneLocations(new []
+            {
+                locationWithoutOutput,
+                locationWithOutput,
+                locationCalculated
+            });
         }
 
         #endregion