Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.TestUtil.Test/TestPipingFailureMechanismTest.cs
===================================================================
diff -u -rbdc32ff91af686a45b08e5f4f4a8d5b45eaba60f -r66b07e7599319ea71ff109d8303f74a4a2e5f71c
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.TestUtil.Test/TestPipingFailureMechanismTest.cs	(.../TestPipingFailureMechanismTest.cs)	(revision bdc32ff91af686a45b08e5f4f4a8d5b45eaba60f)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.TestUtil.Test/TestPipingFailureMechanismTest.cs	(.../TestPipingFailureMechanismTest.cs)	(revision 66b07e7599319ea71ff109d8303f74a4a2e5f71c)
@@ -52,7 +52,7 @@
             // Assert
             Assert.AreEqual(24, failureMechanism.Contribution);
 
-            ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine> surfaceLines = failureMechanism.SurfaceLines;
+            ObservableUniqueItemCollectionWithSourcePath<RingtoetsPipingSurfaceLine> surfaceLines = failureMechanism.SurfaceLines;
             Assert.AreEqual("path/to/surfaceLines", surfaceLines.SourcePath);
             Assert.AreEqual(1, surfaceLines.Count);
             RingtoetsPipingSurfaceLine[] surfaceLineArray = surfaceLines.ToArray();