Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Integration.Test/GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs
===================================================================
diff -u -r0bb11ec189709c999bee440a31c003f00b0a3a2b -r1bcde5cb990364e3a547bac143c9f7a1338fb029
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Integration.Test/GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs)	(revision 0bb11ec189709c999bee440a31c003f00b0a3a2b)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Integration.Test/GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs)	(revision 1bcde5cb990364e3a547bac143c9f7a1338fb029)
@@ -222,7 +222,7 @@
 
             using (new WaveConditionsCalculationServiceConfig())
             {
-                var testService = (TestWaveConditionsCalculationService)WaveConditionsCalculationService.Instance;
+                var testService = (TestWaveConditionsCalculationService) WaveConditionsCalculationService.Instance;
 
                 // Call
                 activity.Run();
@@ -249,15 +249,18 @@
         }
 
         [Test]
-        public void Cancel_WhenPerformingCalculation_CurrentAndSubsequentWaterLevelCalculationsCancelled()
+        public void Cancel_WhenPerformingCalculation_CurrentCalculationForWaterLevelCompletesAndSubsequentCalculationsDidNotRun()
         {
             // Setup
             var assessmentSection = new AssessmentSection(AssessmentSectionComposition.Dike);
             ImportHydraulicBoundaryDatabase(assessmentSection);
 
             GrassCoverErosionOutwardsWaveConditionsCalculation calculation = GetValidCalculation(assessmentSection);
 
-            var activity = new GrassCoverErosionOutwardsWaveConditionsCalculationActivity(calculation, testDataPath, assessmentSection.GrassCoverErosionOutwards, assessmentSection);
+            var activity = new GrassCoverErosionOutwardsWaveConditionsCalculationActivity(calculation,
+                                                                                          testDataPath,
+                                                                                          assessmentSection.GrassCoverErosionOutwards,
+                                                                                          assessmentSection);
 
             using (new WaveConditionsCalculationServiceConfig())
             {
@@ -288,6 +291,42 @@
         }
 
         [Test]
+        public void OnFinish_WhenCancelled_OutputNull()
+        {
+            // Setup
+            var assessmentSection = new AssessmentSection(AssessmentSectionComposition.Dike);
+            ImportHydraulicBoundaryDatabase(assessmentSection);
+
+            GrassCoverErosionOutwardsWaveConditionsCalculation calculation = GetValidCalculation(assessmentSection);
+
+            var activity = new GrassCoverErosionOutwardsWaveConditionsCalculationActivity(calculation,
+                                                                                          testDataPath,
+                                                                                          assessmentSection.GrassCoverErosionOutwards,
+                                                                                          assessmentSection);
+
+            using (new WaveConditionsCalculationServiceConfig())
+            {
+                activity.ProgressChanged += (sender, args) =>
+                {
+                    if (activity.State != ActivityState.Canceled)
+                    {
+                        // Call
+                        activity.Cancel();
+                    }
+                };
+
+                activity.Run();
+
+                // Call
+                activity.Finish();
+
+                // Assert
+                Assert.AreEqual(ActivityState.Canceled, activity.State);
+                Assert.IsNull(calculation.Output);
+            }
+        }
+
+        [Test]
         public void OnFinish_CalculationPerformed_SetsOutput()
         {
             // Setup