Index: Riskeer/MacroStabilityInwards/src/Riskeer.MacroStabilityInwards.Primitives/MacroStabilityInwardsSoilLayer2D.cs
===================================================================
diff -u -r9e9976818f1b446948c3bf815cafe2e023f98ac1 -r5d66a8b46b43830448e3bf8a3bf49a3bc3bbdb50
--- Riskeer/MacroStabilityInwards/src/Riskeer.MacroStabilityInwards.Primitives/MacroStabilityInwardsSoilLayer2D.cs	(.../MacroStabilityInwardsSoilLayer2D.cs)	(revision 9e9976818f1b446948c3bf815cafe2e023f98ac1)
+++ Riskeer/MacroStabilityInwards/src/Riskeer.MacroStabilityInwards.Primitives/MacroStabilityInwardsSoilLayer2D.cs	(.../MacroStabilityInwardsSoilLayer2D.cs)	(revision 5d66a8b46b43830448e3bf8a3bf49a3bc3bbdb50)
@@ -28,7 +28,7 @@
     /// <summary>
     /// This class represents a 2D layer that was imported from D-Soil Model.
     /// </summary>
-    public class MacroStabilityInwardsSoilLayer2D : IMacroStabilityInwardsSoilLayer
+    public sealed class MacroStabilityInwardsSoilLayer2D : IMacroStabilityInwardsSoilLayer
     {
         /// <summary>
         /// Creates a new instance of <see cref="MacroStabilityInwardsSoilLayer2D"/>.
Index: Riskeer/MacroStabilityInwards/test/Riskeer.MacroStabilityInwards.Primitives.Test/MacroStabilityInwardsSoilLayer2DTest.cs
===================================================================
diff -u -r9e9976818f1b446948c3bf815cafe2e023f98ac1 -r5d66a8b46b43830448e3bf8a3bf49a3bc3bbdb50
--- Riskeer/MacroStabilityInwards/test/Riskeer.MacroStabilityInwards.Primitives.Test/MacroStabilityInwardsSoilLayer2DTest.cs	(.../MacroStabilityInwardsSoilLayer2DTest.cs)	(revision 9e9976818f1b446948c3bf815cafe2e023f98ac1)
+++ Riskeer/MacroStabilityInwards/test/Riskeer.MacroStabilityInwards.Primitives.Test/MacroStabilityInwardsSoilLayer2DTest.cs	(.../MacroStabilityInwardsSoilLayer2DTest.cs)	(revision 5d66a8b46b43830448e3bf8a3bf49a3bc3bbdb50)
@@ -36,23 +36,23 @@
         public void Constructor_OuterRingNullWithoutDataAndNestedLayers_ThrowsArgumentNullException()
         {
             // Call
-            TestDelegate test = () => new MacroStabilityInwardsSoilLayer2D(null);
+            void Call() => new MacroStabilityInwardsSoilLayer2D(null);
 
             // Assert
-            var exception = Assert.Throws<ArgumentNullException>(test);
+            var exception = Assert.Throws<ArgumentNullException>(Call);
             Assert.AreEqual("outerRing", exception.ParamName);
         }
 
         [Test]
         public void Constructor_OuterRingNullWithDataAndNestedLayers_ThrowsArgumentNullException()
         {
             // Call
-            TestDelegate test = () => new MacroStabilityInwardsSoilLayer2D(null,
-                                                                           new MacroStabilityInwardsSoilLayerData(),
-                                                                           Enumerable.Empty<MacroStabilityInwardsSoilLayer2D>());
+            void Call() => new MacroStabilityInwardsSoilLayer2D(null,
+                                                                new MacroStabilityInwardsSoilLayerData(),
+                                                                Enumerable.Empty<MacroStabilityInwardsSoilLayer2D>());
 
             // Assert
-            var exception = Assert.Throws<ArgumentNullException>(test);
+            var exception = Assert.Throws<ArgumentNullException>(Call);
             Assert.AreEqual("outerRing", exception.ParamName);
         }
 
@@ -63,10 +63,12 @@
             Ring outerRing = RingTestFactory.CreateRandomRing();
 
             // Call
-            TestDelegate test = () => new MacroStabilityInwardsSoilLayer2D(outerRing, null, Enumerable.Empty<MacroStabilityInwardsSoilLayer2D>());
+            void Call() => new MacroStabilityInwardsSoilLayer2D(outerRing,
+                                                                null,
+                                                                Enumerable.Empty<MacroStabilityInwardsSoilLayer2D>());
 
             // Assert
-            var exception = Assert.Throws<ArgumentNullException>(test);
+            var exception = Assert.Throws<ArgumentNullException>(Call);
             Assert.AreEqual("data", exception.ParamName);
         }
 
@@ -77,10 +79,12 @@
             Ring outerRing = RingTestFactory.CreateRandomRing();
 
             // Call
-            TestDelegate test = () => new MacroStabilityInwardsSoilLayer2D(outerRing, new MacroStabilityInwardsSoilLayerData(), null);
+            void Call() => new MacroStabilityInwardsSoilLayer2D(outerRing,
+                                                                new MacroStabilityInwardsSoilLayerData(),
+                                                                null);
 
             // Assert
-            var exception = Assert.Throws<ArgumentNullException>(test);
+            var exception = Assert.Throws<ArgumentNullException>(Call);
             Assert.AreEqual("nestedLayers", exception.ParamName);
         }
 
@@ -120,18 +124,13 @@
 
         [TestFixture]
         private class MacroStabilityInwardsSoilLayer2DEqualsTest
-            : EqualsTestFixture<MacroStabilityInwardsSoilLayer2D, DerivedMacroStabilityInwardsSoilLayer2D>
+            : EqualsTestFixture<MacroStabilityInwardsSoilLayer2D>
         {
             protected override MacroStabilityInwardsSoilLayer2D CreateObject()
             {
                 return CreateRandomLayer(21);
             }
 
-            protected override DerivedMacroStabilityInwardsSoilLayer2D CreateDerivedObject()
-            {
-                return new DerivedMacroStabilityInwardsSoilLayer2D(CreateRandomLayer(21));
-            }
-
             private static IEnumerable<TestCaseData> GetUnequalTestCases()
             {
                 MacroStabilityInwardsSoilLayer2D baseLayer = CreateRandomLayer(21);
@@ -176,11 +175,5 @@
                                                             });
             }
         }
-
-        private class DerivedMacroStabilityInwardsSoilLayer2D : MacroStabilityInwardsSoilLayer2D
-        {
-            public DerivedMacroStabilityInwardsSoilLayer2D(MacroStabilityInwardsSoilLayer2D layer)
-                : base(layer.OuterRing, layer.Data, layer.NestedLayers) {}
-        }
     }
 }
\ No newline at end of file