Index: Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Forms.Test/PresentationObjects/StabilityStoneCoverWaveConditionsCalculationGroupContextTest.cs
===================================================================
diff -u -rf0792e734ef5296f2ffaae2ad36619a05d5bd9e3 -r1135c8dff2d97eb3b8f17ada1f96bc068ac06bc2
--- Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Forms.Test/PresentationObjects/StabilityStoneCoverWaveConditionsCalculationGroupContextTest.cs	(.../StabilityStoneCoverWaveConditionsCalculationGroupContextTest.cs)	(revision f0792e734ef5296f2ffaae2ad36619a05d5bd9e3)
+++ Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Forms.Test/PresentationObjects/StabilityStoneCoverWaveConditionsCalculationGroupContextTest.cs	(.../StabilityStoneCoverWaveConditionsCalculationGroupContextTest.cs)	(revision 1135c8dff2d97eb3b8f17ada1f96bc068ac06bc2)
@@ -136,6 +136,34 @@
         }
 
         [Test]
+        public void Equals_ToDerivedObject_ReturnsFalse()
+        {
+            // Setup
+            var mocks = new MockRepository();
+            var assessmentSection = mocks.Stub<IAssessmentSection>();
+            mocks.ReplayAll();
+
+            var calculationGroup = new CalculationGroup();
+            var parent = new CalculationGroup();
+            var failureMechanism = new StabilityStoneCoverFailureMechanism();
+            var context = new StabilityStoneCoverWaveConditionsCalculationGroupContext(calculationGroup,
+                                                                                       parent,
+                                                                                       failureMechanism,
+                                                                                       assessmentSection);
+            var derivedContext = new DerivedStabilityStoneCoverWaveConditionsCalculationGroupContext(calculationGroup,
+                                                                                                     parent,
+                                                                                                     failureMechanism,
+                                                                                                     assessmentSection);
+
+            // Call
+            bool isEqual = context.Equals(derivedContext);
+
+            // Assert
+            Assert.IsFalse(isEqual);
+            mocks.VerifyAll();
+        }
+
+        [Test]
         public void Equals_ToOtherWithDifferentWrappedData_ReturnFalse()
         {
             // Setup
@@ -267,5 +295,14 @@
 
             mocks.VerifyAll();
         }
+
+        private class DerivedStabilityStoneCoverWaveConditionsCalculationGroupContext : StabilityStoneCoverWaveConditionsCalculationGroupContext
+        {
+            public DerivedStabilityStoneCoverWaveConditionsCalculationGroupContext(CalculationGroup calculationGroup,
+                                                                                   CalculationGroup parent,
+                                                                                   StabilityStoneCoverFailureMechanism failureMechanism,
+                                                                                   IAssessmentSection assessmentSection)
+                : base(calculationGroup, parent, failureMechanism, assessmentSection) {}
+        }
     }
 }
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