Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Integration.Test/GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs
===================================================================
diff -u -r8efe4bdfd7e47208edb8585a8ac32ebcd56635c0 -r595f353e98d132713e4f64452332eef14627140c
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Integration.Test/GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs)	(revision 8efe4bdfd7e47208edb8585a8ac32ebcd56635c0)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Integration.Test/GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs)	(revision 595f353e98d132713e4f64452332eef14627140c)
@@ -197,10 +197,11 @@
                 activity.Run();
 
                 // Assert
-                foreach (var waterLevel in calculation.InputParameters.WaterLevels)
+                var waterLevels = calculation.InputParameters.WaterLevels.ToArray();
+                for (var i = 0; i < waterLevels.Length; i++)
                 {
-                    var text = string.Format(Resources.GrassCoverErosionOutwardsWaveConditionsCalculationActivity_OnRun_Calculate_waterlevel_0_, waterLevel);
-                    CollectionAssert.Contains(progessTexts, text);
+                    var text = string.Format(Resources.GrassCoverErosionOutwardsWaveConditionsCalculationActivity_OnRun_Calculate_waterlevel_0_, waterLevels[i]);
+                    Assert.AreEqual(progessTexts[i], text);
                 }
             }
         }