Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Forms.Test/PresentationObjects/HydraulicBoundariesGroupContextTest.cs
===================================================================
diff -u -re182f6f394aa75e739467a77e7bcacd9a8b25429 -r776a298963156bcb675a4f1dab0140ca8d34578e
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Forms.Test/PresentationObjects/HydraulicBoundariesGroupContextTest.cs	(.../HydraulicBoundariesGroupContextTest.cs)	(revision e182f6f394aa75e739467a77e7bcacd9a8b25429)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Forms.Test/PresentationObjects/HydraulicBoundariesGroupContextTest.cs	(.../HydraulicBoundariesGroupContextTest.cs)	(revision 776a298963156bcb675a4f1dab0140ca8d34578e)
@@ -39,22 +39,38 @@
         {
             // Setup
             var mockRepository = new MockRepository();
-            var assessmentSectionMock = mockRepository.StrictMock<IAssessmentSection>();
+            var assessmentSectionStub = mockRepository.Stub<IAssessmentSection>();
             mockRepository.ReplayAll();
             var failureMechanism = new GrassCoverErosionOutwardsFailureMechanism();
 
             // Call
-            var context = new HydraulicBoundariesGroupContext(failureMechanism.HydraulicBoundaryLocations, failureMechanism, assessmentSectionMock);
+            var context = new HydraulicBoundariesGroupContext(failureMechanism.HydraulicBoundaryLocations, failureMechanism, assessmentSectionStub);
 
             // Assert
             Assert.IsInstanceOf<ObservableWrappedObjectContextBase<ObservableList<HydraulicBoundaryLocation>>>(context);
             Assert.AreSame(failureMechanism.HydraulicBoundaryLocations, context.WrappedData);
             Assert.AreSame(failureMechanism, context.FailureMechanism);
-            Assert.AreSame(assessmentSectionMock, context.AssessmentSection);
+            Assert.AreSame(assessmentSectionStub, context.AssessmentSection);
             mockRepository.VerifyAll();
         }
 
         [Test]
+        public void Constructor_FailureMechanismNull_ThrowArgumentNullException()
+        {
+            // Setup
+            var mockRepository = new MockRepository();
+            var assessmentSectionStub = mockRepository.Stub<IAssessmentSection>();
+            mockRepository.ReplayAll();
+
+            // Call
+            TestDelegate call = () => new HydraulicBoundariesGroupContext(new ObservableList<HydraulicBoundaryLocation>(), null, assessmentSectionStub);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
+            Assert.AreEqual("failureMechanism", paramName);
+        }
+
+        [Test]
         public void Constructor_AssessmentSectionIsNull_ThrowsArgumentNullException()
         {
             // Setup