Index: Ringtoets/HydraRing/test/Ringtoets.HydraRing.IO.Test/HydraulicLocationConfigurationDatabase/ReadHydraulicLocationConfigurationDatabaseTest.cs
===================================================================
diff -u -r7035927ff4dd773500d6b0fbd1e5b0d2919e6021 -rd4486a72798445a1fafc6bc5f0c68b69f379cec2
--- Ringtoets/HydraRing/test/Ringtoets.HydraRing.IO.Test/HydraulicLocationConfigurationDatabase/ReadHydraulicLocationConfigurationDatabaseTest.cs	(.../ReadHydraulicLocationConfigurationDatabaseTest.cs)	(revision 7035927ff4dd773500d6b0fbd1e5b0d2919e6021)
+++ Ringtoets/HydraRing/test/Ringtoets.HydraRing.IO.Test/HydraulicLocationConfigurationDatabase/ReadHydraulicLocationConfigurationDatabaseTest.cs	(.../ReadHydraulicLocationConfigurationDatabaseTest.cs)	(revision d4486a72798445a1fafc6bc5f0c68b69f379cec2)
@@ -1,4 +1,4 @@
-// Copyright (C) Stichting Deltares 2018. All rights reserved.
+// Copyright (C) Stichting Deltares 2018. All rights reserved.
 //
 // This file is part of Ringtoets.
 //
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using NUnit.Framework;
@@ -30,6 +31,17 @@
     public class ReadHydraulicLocationConfigurationDatabaseTest
     {
         [Test]
+        public void Constructor_LocationIdMappingsNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => new ReadHydraulicLocationConfigurationDatabase(null);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(call);
+            Assert.AreEqual("locationIdMappings", exception.ParamName);
+        }
+
+        [Test]
         public void Constructor_ExpectedValues()
         {
             // Setup