Index: Application/Ringtoets/test/Application.Ringtoets.Storage.TestUtil.Test/RingtoetsProjectTestHelperTest.cs
===================================================================
diff -u -rda7bb9a6d96d7118d6dcdc2ee17a11d5b43f44c7 -re57e79927485e44d681b0617f17bada42dbfb862
--- Application/Ringtoets/test/Application.Ringtoets.Storage.TestUtil.Test/RingtoetsProjectTestHelperTest.cs	(.../RingtoetsProjectTestHelperTest.cs)	(revision da7bb9a6d96d7118d6dcdc2ee17a11d5b43f44c7)
+++ Application/Ringtoets/test/Application.Ringtoets.Storage.TestUtil.Test/RingtoetsProjectTestHelperTest.cs	(.../RingtoetsProjectTestHelperTest.cs)	(revision e57e79927485e44d681b0617f17bada42dbfb862)
@@ -21,6 +21,7 @@
 
 using System.Collections.Generic;
 using System.Linq;
+using Core.Common.Base;
 using Core.Common.Base.Geometry;
 using NUnit.Framework;
 using Ringtoets.ClosingStructures.Data;
@@ -430,15 +431,15 @@
 
             CollectionAssert.IsEmpty(failureMechanism.Calculations);
 
-            List<DuneLocation> duneLocations = failureMechanism.DuneLocations;
+            IObservableEnumerable<DuneLocation> duneLocations = failureMechanism.DuneLocations;
 
-            Assert.AreEqual(3, duneLocations.Count);
-            Assert.IsNull(duneLocations[0].Calculation.Output);
+            Assert.AreEqual(3, duneLocations.Count());
+            Assert.IsNull(duneLocations.ElementAt(0).Calculation.Output);
 
-            Assert.IsNotNull(duneLocations[1].Calculation.Output);
-            Assert.AreEqual(CalculationConvergence.NotCalculated, duneLocations[1].Calculation.Output.CalculationConvergence);
-            Assert.IsNotNull(duneLocations[2].Calculation.Output);
-            Assert.AreEqual(CalculationConvergence.CalculatedConverged, duneLocations[2].Calculation.Output.CalculationConvergence);
+            Assert.IsNotNull(duneLocations.ElementAt(1).Calculation.Output);
+            Assert.AreEqual(CalculationConvergence.NotCalculated, duneLocations.ElementAt(1).Calculation.Output.CalculationConvergence);
+            Assert.IsNotNull(duneLocations.ElementAt(2).Calculation.Output);
+            Assert.AreEqual(CalculationConvergence.CalculatedConverged, duneLocations.ElementAt(2).Calculation.Output.CalculationConvergence);
 
             Assert.AreEqual(3, failureMechanism.SectionResults.Count());
         }