Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingFailureMechanismTest.cs
===================================================================
diff -u -r267be1d4fd22c83ba0ed078df17922adab0658ac -rc67c5e4d2dcf0e3a105aab6b2bb323e9a128ff22
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingFailureMechanismTest.cs	(.../PipingFailureMechanismTest.cs)	(revision 267be1d4fd22c83ba0ed078df17922adab0658ac)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingFailureMechanismTest.cs	(.../PipingFailureMechanismTest.cs)	(revision c67c5e4d2dcf0e3a105aab6b2bb323e9a128ff22)
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using Core.Common.Base;
 using Core.Common.Base.Geometry;
@@ -32,7 +33,7 @@
             Assert.IsInstanceOf<GeneralPipingInput>(piping.GeneralInput);
             CollectionAssert.IsEmpty(piping.Sections);
             CollectionAssert.IsEmpty(piping.SurfaceLines);
-            Assert.IsInstanceOf<ObservableList<RingtoetsPipingSurfaceLine>>(piping.SurfaceLines);
+            Assert.IsInstanceOf<List<RingtoetsPipingSurfaceLine>>(piping.SurfaceLines);
             CollectionAssert.IsEmpty(piping.StochasticSoilModels);
             Assert.IsInstanceOf<ObservableList<StochasticSoilModel>>(piping.StochasticSoilModels);
             Assert.AreEqual("Berekeningen", piping.CalculationsGroup.Name);