Index: Ringtoets/HeightStructures/test/Ringtoets.HeightStructures.IO.Test/Configurations/HeightStructuresCalculationConfigurationReaderTest.cs
===================================================================
diff -u -r8b567830c978aa32ef7fbe0a16d71f637ff383e3 -r6949918830314633db5cc8c16bb2188779fffc93
--- Ringtoets/HeightStructures/test/Ringtoets.HeightStructures.IO.Test/Configurations/HeightStructuresCalculationConfigurationReaderTest.cs	(.../HeightStructuresCalculationConfigurationReaderTest.cs)	(revision 8b567830c978aa32ef7fbe0a16d71f637ff383e3)
+++ Ringtoets/HeightStructures/test/Ringtoets.HeightStructures.IO.Test/Configurations/HeightStructuresCalculationConfigurationReaderTest.cs	(.../HeightStructuresCalculationConfigurationReaderTest.cs)	(revision 6949918830314633db5cc8c16bb2188779fffc93)
@@ -230,12 +230,11 @@
             var reader = new HeightStructuresCalculationConfigurationReader(filePath);
 
             // Call
-            List<IConfigurationItem> readConfigurationItems = reader.Read().ToList();
+            IEnumerable<IConfigurationItem> readConfigurationItems = reader.Read().ToArray();
 
             // Assert
-            Assert.AreEqual(1, readConfigurationItems.Count);
+            var calculation = (HeightStructuresCalculationConfiguration) readConfigurationItems.Single();
 
-            var calculation = (HeightStructuresCalculationConfiguration) readConfigurationItems[0];
             Assert.IsNull(calculation.StructureNormalOrientation);
             Assert.IsNull(calculation.StructureId);
             Assert.IsNull(calculation.HydraulicBoundaryLocationName);
@@ -265,12 +264,11 @@
             var reader = new HeightStructuresCalculationConfigurationReader(filePath);
 
             // Call
-            List<IConfigurationItem> readConfigurationItems = reader.Read().ToList();
+            IEnumerable<IConfigurationItem> readConfigurationItems = reader.Read().ToArray();
 
             // Assert
-            Assert.AreEqual(1, readConfigurationItems.Count);
+            var calculation = (HeightStructuresCalculationConfiguration) readConfigurationItems.Single();
 
-            var calculation = (HeightStructuresCalculationConfiguration) readConfigurationItems[0];
             Assert.AreEqual(67.1, calculation.StructureNormalOrientation);
             Assert.AreEqual("kunstwerk1", calculation.StructureId);
             Assert.AreEqual("Locatie1", calculation.HydraulicBoundaryLocationName);
@@ -310,12 +308,11 @@
             var reader = new HeightStructuresCalculationConfigurationReader(filePath);
 
             // Call
-            List<IConfigurationItem> readConfigurationItems = reader.Read().ToList();
+            IEnumerable<IConfigurationItem> readConfigurationItems = reader.Read().ToArray();
 
             // Assert
-            Assert.AreEqual(1, readConfigurationItems.Count);
+            var calculation = (HeightStructuresCalculationConfiguration) readConfigurationItems.Single();
 
-            var calculation = (HeightStructuresCalculationConfiguration) readConfigurationItems[0];
             Assert.IsTrue(double.IsNegativeInfinity(calculation.StructureNormalOrientation.Value));
             Assert.IsNull(calculation.StructureId);
             Assert.IsNull(calculation.HydraulicBoundaryLocationName);
@@ -355,12 +352,11 @@
             var reader = new HeightStructuresCalculationConfigurationReader(filePath);
 
             // Call
-            List<IConfigurationItem> readConfigurationItems = reader.Read().ToList();
+            IEnumerable<IConfigurationItem> readConfigurationItems = reader.Read().ToArray();
 
             // Assert
-            Assert.AreEqual(1, readConfigurationItems.Count);
+            var calculation = (HeightStructuresCalculationConfiguration) readConfigurationItems.Single();
 
-            var calculation = (HeightStructuresCalculationConfiguration) readConfigurationItems[0];
             Assert.IsNaN(calculation.StructureNormalOrientation);
             Assert.IsNull(calculation.StructureId);
             Assert.IsNull(calculation.HydraulicBoundaryLocationName);
@@ -400,12 +396,11 @@
             var reader = new HeightStructuresCalculationConfigurationReader(filePath);
 
             // Call
-            List<IConfigurationItem> readConfigurationItems = reader.Read().ToList();
+            IEnumerable<IConfigurationItem> readConfigurationItems = reader.Read().ToArray();
 
             // Assert
-            Assert.AreEqual(1, readConfigurationItems.Count);
+            var calculation = (HeightStructuresCalculationConfiguration) readConfigurationItems.Single();
 
-            var calculation = (HeightStructuresCalculationConfiguration) readConfigurationItems[0];
             Assert.IsNull(calculation.StructureNormalOrientation);
             Assert.IsNull(calculation.StructureId);
             Assert.AreEqual("Locatie1", calculation.HydraulicBoundaryLocationName);
@@ -441,12 +436,11 @@
             var reader = new HeightStructuresCalculationConfigurationReader(filePath);
 
             // Call
-            List<IConfigurationItem> readConfigurationItems = reader.Read().ToList();
+            IEnumerable<IConfigurationItem> readConfigurationItems = reader.Read().ToArray();
 
             // Assert
-            Assert.AreEqual(1, readConfigurationItems.Count);
+            var calculation = (HeightStructuresCalculationConfiguration) readConfigurationItems.Single();
 
-            var calculation = (HeightStructuresCalculationConfiguration) readConfigurationItems[0];
             Assert.IsNull(calculation.StructureNormalOrientation);
             Assert.IsNull(calculation.StructureId);
             Assert.IsNull(calculation.HydraulicBoundaryLocationName);