Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Data.Test/SoilProfile/MacroStabilityInwardsSoilLayer1DTest.cs
===================================================================
diff -u -r69d647795daacbf48e17d0cf3a02a21865ab4ae6 -rc91246ef0f88eff9950857a6f2c404653a022dcc
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Data.Test/SoilProfile/MacroStabilityInwardsSoilLayer1DTest.cs	(.../MacroStabilityInwardsSoilLayer1DTest.cs)	(revision 69d647795daacbf48e17d0cf3a02a21865ab4ae6)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Data.Test/SoilProfile/MacroStabilityInwardsSoilLayer1DTest.cs	(.../MacroStabilityInwardsSoilLayer1DTest.cs)	(revision c91246ef0f88eff9950857a6f2c404653a022dcc)
@@ -40,6 +40,7 @@
             var layer = new MacroStabilityInwardsSoilLayer1D(top);
 
             // Assert
+            Assert.IsInstanceOf<IMacroStabilityInwardsSoilLayer>(layer);
             Assert.NotNull(layer);
             Assert.NotNull(layer.Data);
             Assert.AreEqual(top, layer.Top);