Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingFailureMechanismTest.cs
===================================================================
diff -u -rc5f90c4f9b42d985f16f99ad8732576b9217267a -rf5e1194ee412e86277cee388a75c39db189f2b3e
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingFailureMechanismTest.cs	(.../PipingFailureMechanismTest.cs)	(revision c5f90c4f9b42d985f16f99ad8732576b9217267a)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingFailureMechanismTest.cs	(.../PipingFailureMechanismTest.cs)	(revision f5e1194ee412e86277cee388a75c39db189f2b3e)
@@ -49,6 +49,7 @@
 
             // Assert
             Assert.IsInstanceOf<FailureMechanismBase>(piping);
+            Assert.IsInstanceOf<ICalculatableFailureMechanism>(piping);
             Assert.AreEqual(Resources.PipingFailureMechanism_DisplayName, piping.Name);
             Assert.AreEqual(Resources.PipingFailureMechanism_DisplayCode, piping.Code);
             Assert.IsInstanceOf<GeneralPipingInput>(piping.GeneralInput);