Index: Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Views/DesignWaterLevelLocationsViewTest.cs
===================================================================
diff -u -r1042a38d3663daeda5a8e1083edbc63a4b6aae94 -r5964d4196c1f7f02df79e98ef4f876a338abef62
--- Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Views/DesignWaterLevelLocationsViewTest.cs	(.../DesignWaterLevelLocationsViewTest.cs)	(revision 1042a38d3663daeda5a8e1083edbc63a4b6aae94)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Views/DesignWaterLevelLocationsViewTest.cs	(.../DesignWaterLevelLocationsViewTest.cs)	(revision 5964d4196c1f7f02df79e98ef4f876a338abef62)
@@ -205,7 +205,9 @@
         }
 
         [Test]
-        public void CalculateForSelectedButton_OneSelected_CallsCalculateDesignWaterLevels()
+        [TestCase(true)]
+        [TestCase(false)]
+        public void CalculateForSelectedButton_OneSelected_CallsCalculateDesignWaterLevels(bool isSuccessful)
         {
             // Setup
             DesignWaterLevelLocationsView view = ShowFullyConfiguredDesignWaterLevelLocationsView();
@@ -217,14 +219,22 @@
             var mockRepository = new MockRepository();
             var guiServiceMock = mockRepository.StrictMock<IHydraulicBoundaryLocationCalculationGuiService>();
 
+            var observer = mockRepository.StrictMock<IObserver>();
+            assessmentSection.HydraulicBoundaryDatabase.Attach(observer);
+
+            if (isSuccessful)
+            {
+                observer.Expect(o => o.UpdateObserver());
+            }
+
             ICalculationMessageProvider messageProvider = null;
             IEnumerable<HydraulicBoundaryLocation> locations = null;
             guiServiceMock.Expect(ch => ch.CalculateDesignWaterLevels(null, null, null, 1, null)).IgnoreArguments().WhenCalled(
                 invocation =>
                 {
-                    locations = (IEnumerable<HydraulicBoundaryLocation>)invocation.Arguments[1];
+                    locations = (IEnumerable<HydraulicBoundaryLocation>) invocation.Arguments[1];
                     messageProvider = (ICalculationMessageProvider) invocation.Arguments[4];
-                }).Return(false);
+                }).Return(isSuccessful);
             mockRepository.ReplayAll();
 
             view.CalculationGuiService = guiServiceMock;