Index: Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Service.Test/StabilityStoneCoverWaveConditionsCalculationActivityTest.cs
===================================================================
diff -u -r02670d8c9fceeaea5f829937a2eb269f3488c6b1 -re4f43547afaab47559c5aa667b1aac661a0d1a8b
--- Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Service.Test/StabilityStoneCoverWaveConditionsCalculationActivityTest.cs	(.../StabilityStoneCoverWaveConditionsCalculationActivityTest.cs)	(revision 02670d8c9fceeaea5f829937a2eb269f3488c6b1)
+++ Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Service.Test/StabilityStoneCoverWaveConditionsCalculationActivityTest.cs	(.../StabilityStoneCoverWaveConditionsCalculationActivityTest.cs)	(revision e4f43547afaab47559c5aa667b1aac661a0d1a8b)
@@ -24,6 +24,7 @@
 using NUnit.Framework;
 using Rhino.Mocks;
 using Ringtoets.Common.Data.AssessmentSection;
+using Ringtoets.HydraRing.Calculation.Activities;
 using Ringtoets.StabilityStoneCover.Data;
 
 namespace Ringtoets.StabilityStoneCover.Service.Test
@@ -46,6 +47,7 @@
             var activity = new StabilityStoneCoverWaveConditionsCalculationActivity(calculation, string.Empty, failureMechanism, assessmentSectionMock);
 
             // Assert
+            Assert.IsInstanceOf<HydraRingActivityBase>(activity);
             Assert.IsNull(activity.ProgressText);
             Assert.AreEqual(ActivityState.None, activity.State);
             Assert.AreEqual(string.Format("Golfcondities voor blokken en zuilen voor {0} berekenen", calculation.Name), activity.Name);