Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Service.Test/GrassCoverErosionOutwardsWaveConditionsCalculationActivityTest.cs
===================================================================
diff -u -r02670d8c9fceeaea5f829937a2eb269f3488c6b1 -r0fe6f60021cee37e16f68fa89feb3bd36759a98a
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Service.Test/GrassCoverErosionOutwardsWaveConditionsCalculationActivityTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationActivityTest.cs)	(revision 02670d8c9fceeaea5f829937a2eb269f3488c6b1)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Service.Test/GrassCoverErosionOutwardsWaveConditionsCalculationActivityTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationActivityTest.cs)	(revision 0fe6f60021cee37e16f68fa89feb3bd36759a98a)
@@ -25,6 +25,7 @@
 using Rhino.Mocks;
 using Ringtoets.Common.Data.AssessmentSection;
 using Ringtoets.GrassCoverErosionOutwards.Data;
+using Ringtoets.HydraRing.Calculation.Activities;
 
 namespace Ringtoets.GrassCoverErosionOutwards.Service.Test
 {
@@ -46,6 +47,7 @@
             var activity = new GrassCoverErosionOutwardsWaveConditionsCalculationActivity(calculation, string.Empty, failureMechanism, assessmentSectionMock);
 
             // Assert
+            Assert.IsInstanceOf<HydraRingActivityBase>(activity);
             Assert.IsNull(activity.ProgressText);
             Assert.AreEqual(ActivityState.None, activity.State);
             Assert.AreEqual(calculation.Name, activity.Name);