Index: Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.IO.Test/Configurations/ClosingStructuresCalculationConfigurationReaderTest.cs
===================================================================
diff -u -r964f8948f0ec59095ea9cc58fdabd706c4b17d22 -r6949918830314633db5cc8c16bb2188779fffc93
--- Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.IO.Test/Configurations/ClosingStructuresCalculationConfigurationReaderTest.cs	(.../ClosingStructuresCalculationConfigurationReaderTest.cs)	(revision 964f8948f0ec59095ea9cc58fdabd706c4b17d22)
+++ Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.IO.Test/Configurations/ClosingStructuresCalculationConfigurationReaderTest.cs	(.../ClosingStructuresCalculationConfigurationReaderTest.cs)	(revision 6949918830314633db5cc8c16bb2188779fffc93)
@@ -305,12 +305,11 @@
             var reader = new ClosingStructuresCalculationConfigurationReader(filePath);
 
             // Call
-            List<IConfigurationItem> readConfigurationItems = reader.Read().ToList();
+            IEnumerable<IConfigurationItem> readConfigurationItems = reader.Read().ToArray();
 
             // Assert
-            Assert.AreEqual(1, readConfigurationItems.Count);
+            var calculation = (ClosingStructuresCalculationConfiguration) readConfigurationItems.Single();
 
-            var calculation = (ClosingStructuresCalculationConfiguration) readConfigurationItems[0];
             Assert.IsNull(calculation.StructureNormalOrientation);
             Assert.IsNull(calculation.StructureId);
             Assert.IsNull(calculation.HydraulicBoundaryLocationName);
@@ -339,12 +338,11 @@
             var reader = new ClosingStructuresCalculationConfigurationReader(filePath);
 
             // Call
-            List<IConfigurationItem> readConfigurationItems = reader.Read().ToList();
+            IEnumerable<IConfigurationItem> readConfigurationItems = reader.Read().ToArray();
 
             // Assert
-            Assert.AreEqual(1, readConfigurationItems.Count);
+            var calculation = (ClosingStructuresCalculationConfiguration) readConfigurationItems.Single();
 
-            var calculation = (ClosingStructuresCalculationConfiguration) readConfigurationItems[0];
             Assert.AreEqual(67.1, calculation.StructureNormalOrientation);
             Assert.AreEqual("kunstwerk1", calculation.StructureId);
             Assert.AreEqual("Locatie1", calculation.HydraulicBoundaryLocationName);
@@ -397,12 +395,11 @@
             var reader = new ClosingStructuresCalculationConfigurationReader(filePath);
 
             // Call
-            List<IConfigurationItem> readConfigurationItems = reader.Read().ToList();
+            IEnumerable<IConfigurationItem> readConfigurationItems = reader.Read().ToArray();
 
             // Assert
-            Assert.AreEqual(1, readConfigurationItems.Count);
+            var calculation = (ClosingStructuresCalculationConfiguration) readConfigurationItems.Single();
 
-            var calculation = (ClosingStructuresCalculationConfiguration) readConfigurationItems[0];
             Assert.IsTrue(double.IsNegativeInfinity(calculation.StructureNormalOrientation.Value));
             Assert.IsNull(calculation.StructureId);
             Assert.IsNull(calculation.HydraulicBoundaryLocationName);
@@ -453,12 +450,11 @@
             var reader = new ClosingStructuresCalculationConfigurationReader(filePath);
 
             // Call
-            List<IConfigurationItem> readConfigurationItems = reader.Read().ToList();
+            IEnumerable<IConfigurationItem> readConfigurationItems = reader.Read().ToArray();
 
             // Assert
-            Assert.AreEqual(1, readConfigurationItems.Count);
+            var calculation = (ClosingStructuresCalculationConfiguration) readConfigurationItems.Single();
 
-            var calculation = (ClosingStructuresCalculationConfiguration) readConfigurationItems[0];
             Assert.IsNaN(calculation.StructureNormalOrientation);
             Assert.IsNull(calculation.StructureId);
             Assert.IsNull(calculation.HydraulicBoundaryLocationName);
@@ -509,12 +505,11 @@
             var reader = new ClosingStructuresCalculationConfigurationReader(filePath);
 
             // Call
-            List<IConfigurationItem> readConfigurationItems = reader.Read().ToList();
+            IEnumerable<IConfigurationItem> readConfigurationItems = reader.Read().ToArray();
 
             // Assert
-            Assert.AreEqual(1, readConfigurationItems.Count);
+            var calculation = (ClosingStructuresCalculationConfiguration) readConfigurationItems.Single();
 
-            var calculation = (ClosingStructuresCalculationConfiguration) readConfigurationItems[0];
             Assert.IsNull(calculation.StructureNormalOrientation);
             Assert.IsNull(calculation.StructureId);
             Assert.AreEqual("Locatie1", calculation.HydraulicBoundaryLocationName);
@@ -560,12 +555,11 @@
             var reader = new ClosingStructuresCalculationConfigurationReader(filePath);
 
             // Call
-            List<IConfigurationItem> readConfigurationItems = reader.Read().ToList();
+            IEnumerable<IConfigurationItem> readConfigurationItems = reader.Read().ToArray();
 
             // Assert
-            Assert.AreEqual(1, readConfigurationItems.Count);
+            var calculation = (ClosingStructuresCalculationConfiguration) readConfigurationItems.Single();
 
-            var calculation = (ClosingStructuresCalculationConfiguration) readConfigurationItems[0];
             Assert.IsNull(calculation.StructureNormalOrientation);
             Assert.IsNull(calculation.StructureId);
             Assert.IsNull(calculation.HydraulicBoundaryLocationName);