Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Service.Test/GrassCoverErosionOutwardsDataSynchronizationServiceTest.cs
===================================================================
diff -u -re82f04fb50a7b5a6f9c45289258c00c94aa8c64c -rc964c048005d93b097a1e6a817dace95b293040f
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Service.Test/GrassCoverErosionOutwardsDataSynchronizationServiceTest.cs	(.../GrassCoverErosionOutwardsDataSynchronizationServiceTest.cs)	(revision e82f04fb50a7b5a6f9c45289258c00c94aa8c64c)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Service.Test/GrassCoverErosionOutwardsDataSynchronizationServiceTest.cs	(.../GrassCoverErosionOutwardsDataSynchronizationServiceTest.cs)	(revision c964c048005d93b097a1e6a817dace95b293040f)
@@ -193,6 +193,40 @@
             CollectionAssert.AreEqual(expectedAffectedCalculations, affectedItems);
         }
 
+        [Test]
+        public void ClearReferenceLineDependentData_FailureMechanismNull_ThrowArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => GrassCoverErosionOutwardsDataSynchronizationService.ClearReferenceLineDependentData(null);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
+            Assert.AreEqual("failureMechanism", paramName);
+        }
+
+        [Test]
+        public void ClearReferenceLineDependentData_FullyConfiguredFailureMechanism_RemoveFailureMechanismDependentData()
+        {
+            // Setup
+            GrassCoverErosionOutwardsFailureMechanism failureMechanism = CreateFullyConfiguredFailureMechanism();
+
+            // Call
+            IObservable[] observables = GrassCoverErosionOutwardsDataSynchronizationService.ClearReferenceLineDependentData(failureMechanism).ToArray();
+
+            // Assert
+            Assert.AreEqual(3, observables.Length);
+
+            CollectionAssert.IsEmpty(failureMechanism.Sections);
+            CollectionAssert.IsEmpty(failureMechanism.SectionResults);
+            CollectionAssert.Contains(observables, failureMechanism);
+
+            CollectionAssert.IsEmpty(failureMechanism.WaveConditionsCalculationGroup.Children);
+            CollectionAssert.Contains(observables, failureMechanism.WaveConditionsCalculationGroup);
+
+            CollectionAssert.IsEmpty(failureMechanism.ForeshoreProfiles);
+            CollectionAssert.Contains(observables, failureMechanism.ForeshoreProfiles);
+        }
+
         private static GrassCoverErosionOutwardsFailureMechanism CreateFullyConfiguredFailureMechanism()
         {
             var failureMechanism = new GrassCoverErosionOutwardsFailureMechanism();