Index: Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Data.Test/DuneErosionFailureMechanismTest.cs
===================================================================
diff -u -r089df2ef98ca525c6b6235eb75be97f25862c689 -r29907f7ee9dabab5cfb9a8ca2103da5e5bcc1a90
--- Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Data.Test/DuneErosionFailureMechanismTest.cs	(.../DuneErosionFailureMechanismTest.cs)	(revision 089df2ef98ca525c6b6235eb75be97f25862c689)
+++ Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Data.Test/DuneErosionFailureMechanismTest.cs	(.../DuneErosionFailureMechanismTest.cs)	(revision 29907f7ee9dabab5cfb9a8ca2103da5e5bcc1a90)
@@ -20,8 +20,10 @@
 // All rights reserved.
 
 using System.Linq;
+using Core.Common.Base;
 using Core.Common.Base.Geometry;
 using NUnit.Framework;
+using Rhino.Mocks;
 using Ringtoets.Common.Data.FailureMechanism;
 using Ringtoets.Common.Data.TestUtil;
 
@@ -50,7 +52,13 @@
         public void AddSection_WithSection_AddedDuneErosionFailureMechanismSectionResult()
         {
             // Setup
+            var mocks = new MockRepository();
+            var observer = mocks.Stub<IObserver>();
+            observer.Expect(o => o.UpdateObserver());
+            mocks.ReplayAll();
+
             var failureMechanism = new DuneErosionFailureMechanism();
+            failureMechanism.SectionResults.Attach(observer);
 
             // Call
             failureMechanism.AddSection(new FailureMechanismSection("", new[]
@@ -61,6 +69,42 @@
             // Assert
             Assert.AreEqual(1, failureMechanism.SectionResults.Count());
             Assert.IsInstanceOf<DuneErosionFailureMechanismSectionResult>(failureMechanism.SectionResults.ElementAt(0));
+            mocks.VerifyAll();
         }
+
+        [Test]
+        public void ClearAllSections_WithSectionsAndSectionResults_SectionsAndSectionResultsCleared()
+        {
+            // Setup
+            var mocks = new MockRepository();
+            var observer = mocks.Stub<IObserver>();
+            observer.Expect(o => o.UpdateObserver());
+            mocks.ReplayAll();
+
+            var failureMechanism = new DuneErosionFailureMechanism();
+
+            failureMechanism.AddSection(new FailureMechanismSection("", new[]
+            {
+                new Point2D(2, 1)
+            }));
+            failureMechanism.AddSection(new FailureMechanismSection("", new[]
+            {
+                new Point2D(2, 1)
+            }));
+
+            failureMechanism.SectionResults.Attach(observer);
+
+            // Precondition
+            Assert.AreEqual(2, failureMechanism.Sections.Count());
+            Assert.AreEqual(2, failureMechanism.SectionResults.Count);
+
+            // Call
+            failureMechanism.ClearAllSections();
+
+            // Assert
+            Assert.AreEqual(0, failureMechanism.Sections.Count());
+            Assert.AreEqual(0, failureMechanism.SectionResults.Count);
+            mocks.ReplayAll();
+        }
     }
 }
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