Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.Test/GrassCoverErosionInwardsCalculationTest.cs
===================================================================
diff -u -r392c4a63ebfaee062d8dc611ecf41881ac1fe3a5 -r0a94ed42cb943659d68be2ce6fb430f8f29fc3f3
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.Test/GrassCoverErosionInwardsCalculationTest.cs	(.../GrassCoverErosionInwardsCalculationTest.cs)	(revision 392c4a63ebfaee062d8dc611ecf41881ac1fe3a5)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.Test/GrassCoverErosionInwardsCalculationTest.cs	(.../GrassCoverErosionInwardsCalculationTest.cs)	(revision 0a94ed42cb943659d68be2ce6fb430f8f29fc3f3)
@@ -173,9 +173,26 @@
             ICalculationInput input = calculation.GetObservableInput();
 
             // Assert
-            Assert.AreEqual(inputParameters, input);
+            Assert.AreSame(inputParameters, input);
         }
 
+        [Test]
+        public void GetObservalbeOutput_Always_ReturnsOutput()
+        {
+            // Setup
+            var output = new GrassCoverErosionInwardsOutput(2.0, 3.0, 1.4, 50.3, 16.3);
+            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput())
+            {
+                Output = output
+            };
+
+            // Call
+            ICalculationOutput calculationOutput = calculation.GetObservableOutput();
+
+            // Assert
+            Assert.AreSame(output, calculationOutput);
+        }
+
         private void AssertDemoInput(GrassCoverErosionInwardsInput inputParameters)
         {
             // BreakWater