Index: Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Create/Piping/PipingFailureMechanismCreateExtensionsTest.cs
===================================================================
diff -u -r16df8541528639fd1e8d9f2584fae28808b63fad -r548ebfbd35f147dc64cb0d566fe8f30ec2a0e434
--- Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Create/Piping/PipingFailureMechanismCreateExtensionsTest.cs	(.../PipingFailureMechanismCreateExtensionsTest.cs)	(revision 16df8541528639fd1e8d9f2584fae28808b63fad)
+++ Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Create/Piping/PipingFailureMechanismCreateExtensionsTest.cs	(.../PipingFailureMechanismCreateExtensionsTest.cs)	(revision 548ebfbd35f147dc64cb0d566fe8f30ec2a0e434)
@@ -164,7 +164,7 @@
             Assert.AreEqual(1, entity.PipingFailureMechanismMetaEntities.Count);
 
             string stochasticSoilModelCollectionSourcePath = entity.PipingFailureMechanismMetaEntities
-                                                                   .First()
+                                                                   .Single()
                                                                    .StochasticSoilModelCollectionSourcePath;
             Assert.AreNotSame(somePath, stochasticSoilModelCollectionSourcePath);
             Assert.AreEqual(somePath, stochasticSoilModelCollectionSourcePath);
@@ -210,7 +210,7 @@
             Assert.AreEqual(failureMechanism.SurfaceLines.Count, entity.SurfaceLineEntities.Count);
 
             string surfaceLineCollectionSourcePath = entity.PipingFailureMechanismMetaEntities
-                                                           .First()
+                                                           .Single()
                                                            .SurfaceLineCollectionSourcePath;
             Assert.AreNotSame(somePath, surfaceLineCollectionSourcePath);
             Assert.AreEqual(somePath, surfaceLineCollectionSourcePath);