Index: Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Read/ClosingStructures/ClosingStructuresCalculationEntityReadExtensionsTest.cs
===================================================================
diff -u -r46b7b8c7ae08c83f5a21504d5e1f2f47b33b5e40 -ree999e492a57d9bbb3777754651e9f4722611075
--- Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Read/ClosingStructures/ClosingStructuresCalculationEntityReadExtensionsTest.cs	(.../ClosingStructuresCalculationEntityReadExtensionsTest.cs)	(revision 46b7b8c7ae08c83f5a21504d5e1f2f47b33b5e40)
+++ Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Read/ClosingStructures/ClosingStructuresCalculationEntityReadExtensionsTest.cs	(.../ClosingStructuresCalculationEntityReadExtensionsTest.cs)	(revision ee999e492a57d9bbb3777754651e9f4722611075)
@@ -294,5 +294,30 @@
             // Assert
             Assert.IsTrue(calculation.HasOutput);
         }
+
+
+        [Test]
+        public void Read_CalculationEntityAlreadyRead_ReturnReadCalculation()
+        {
+            // Setup
+            var entity = new ClosingStructuresCalculationEntity
+            {
+                ClosingStructuresOutputEntities =
+                {
+                    new ClosingStructuresOutputEntity()
+                }
+            };
+
+            var calculation = new StructuresCalculation<ClosingStructuresInput>();
+
+            var collector = new ReadConversionCollector();
+            collector.Read(entity, calculation);
+
+            // Call
+            StructuresCalculation<ClosingStructuresInput> returnedCalculation = entity.Read(collector);
+
+            // Assert
+            Assert.AreSame(calculation, returnedCalculation);
+        }
     }
 }
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