Index: Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Read/StabilityPointStructures/StabilityPointStructureCalculationEntityReadExtensionsTest.cs
===================================================================
diff -u -rc3378ccfc96767cbac99fa57ae60d08667555f01 -r2a5cd2c947d34e2a70d24297db29a8822bddcc2f
--- Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Read/StabilityPointStructures/StabilityPointStructureCalculationEntityReadExtensionsTest.cs	(.../StabilityPointStructureCalculationEntityReadExtensionsTest.cs)	(revision c3378ccfc96767cbac99fa57ae60d08667555f01)
+++ Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Read/StabilityPointStructures/StabilityPointStructureCalculationEntityReadExtensionsTest.cs	(.../StabilityPointStructureCalculationEntityReadExtensionsTest.cs)	(revision 2a5cd2c947d34e2a70d24297db29a8822bddcc2f)
@@ -51,6 +51,25 @@
         }
 
         [Test]
+        public void Read_EntityNotReadBefore_RegisterEntity()
+        {
+            // Setup
+            var entity = new StabilityPointStructuresCalculationEntity();
+
+            var collector = new ReadConversionCollector();
+
+            // Precondition
+            Assert.IsFalse(collector.Contains(entity));
+
+            // Call
+            StructuresCalculation<StabilityPointStructuresInput> calculation = entity.Read(collector);
+
+            // Assert
+            Assert.IsTrue(collector.Contains(entity));
+            Assert.AreSame(calculation, collector.Get(entity));
+        }
+
+        [Test]
         public void Read_ValidEntity_ReturnStabilityPointStructuresCalculation()
         {
             // Setup
@@ -382,5 +401,29 @@
             // Assert
             Assert.IsTrue(calculation.HasOutput);
         }
+
+        [Test]
+        public void Read_CalculationEntityAlreadyRead_ReturnReadCalculation()
+        {
+            // Setup
+            var entity = new StabilityPointStructuresCalculationEntity
+            {
+                StabilityPointStructuresOutputEntities =
+                {
+                    new StabilityPointStructuresOutputEntity()
+                }
+            };
+
+            var calculation = new StructuresCalculation<StabilityPointStructuresInput>();
+
+            var collector = new ReadConversionCollector();
+            collector.Read(entity, calculation);
+
+            // Call
+            StructuresCalculation<StabilityPointStructuresInput> returnedCalculation = entity.Read(collector);
+
+            // Assert
+            Assert.AreSame(calculation, returnedCalculation);
+        }
     }
 }
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