Index: Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Data.Test/DuneLocationCalculationTest.cs
===================================================================
diff -u -rc743d1f229ff553fff9a05964c1adac6e510df4a -ree62f9ef8c69cd574bd23077bf9079e3e8fbdd8c
--- Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Data.Test/DuneLocationCalculationTest.cs	(.../DuneLocationCalculationTest.cs)	(revision c743d1f229ff553fff9a05964c1adac6e510df4a)
+++ Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Data.Test/DuneLocationCalculationTest.cs	(.../DuneLocationCalculationTest.cs)	(revision ee62f9ef8c69cd574bd23077bf9079e3e8fbdd8c)
@@ -20,6 +20,7 @@
 // All rights reserved.
 
 using System;
+using Core.Common.Base;
 using NUnit.Framework;
 using Ringtoets.DuneErosion.Data.TestUtil;
 
@@ -46,11 +47,12 @@
             var duneLocation = new TestDuneLocation();
 
             // Call
-            var duneLocationCalculation = new DuneLocationCalculation(duneLocation);
+            var calculation = new DuneLocationCalculation(duneLocation);
 
             // Assert
-            Assert.AreSame(duneLocation, duneLocationCalculation.DuneLocation);
-            Assert.IsNull(duneLocationCalculation.Output);
+            Assert.IsInstanceOf<Observable>(calculation);
+            Assert.AreSame(duneLocation, calculation.DuneLocation);
+            Assert.IsNull(calculation.Output);
         }
     }
 }