Index: Ringtoets/Common/test/Ringtoets.Common.Data.Test/Hydraulics/HydraulicBoundaryLocationCalculationTest.cs
===================================================================
diff -u -rbe503a934e5872a244369c7ef25b043c6e0c614f -r1026dd2d5cef03cffca2f390ef5e7ce0a07e33dd
--- Ringtoets/Common/test/Ringtoets.Common.Data.Test/Hydraulics/HydraulicBoundaryLocationCalculationTest.cs	(.../HydraulicBoundaryLocationCalculationTest.cs)	(revision be503a934e5872a244369c7ef25b043c6e0c614f)
+++ Ringtoets/Common/test/Ringtoets.Common.Data.Test/Hydraulics/HydraulicBoundaryLocationCalculationTest.cs	(.../HydraulicBoundaryLocationCalculationTest.cs)	(revision 1026dd2d5cef03cffca2f390ef5e7ce0a07e33dd)
@@ -21,6 +21,7 @@
 
 using System;
 using System.Collections.Generic;
+using Core.Common.Base;
 using NUnit.Framework;
 using Ringtoets.Common.Data.Hydraulics;
 using Ringtoets.Common.Data.TestUtil;
@@ -52,8 +53,9 @@
             var calculation = new HydraulicBoundaryLocationCalculation(hydraulicBoundaryLocation);
 
             // Assert
+            Assert.IsInstanceOf<Observable>(calculation);
             Assert.AreSame(hydraulicBoundaryLocation, calculation.HydraulicBoundaryLocation);
-            Assert.IsInstanceOf<HydraulicBoundaryLocationCalculationInput>(calculation.InputParameters);
+            Assert.IsNotNull(calculation.InputParameters);
             Assert.IsNull(calculation.Output);
         }