Index: Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.IO.Test/Configurations/Helpers/ConfigurationClosingStructureInflowModelTypeConverterTest.cs
===================================================================
diff -u -r39864a3af725b9bb35bf4aa3e1774fb1c47a9270 -re772d0383cfbaf86b76034071d206af304a0de4d
--- Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.IO.Test/Configurations/Helpers/ConfigurationClosingStructureInflowModelTypeConverterTest.cs	(.../ConfigurationClosingStructureInflowModelTypeConverterTest.cs)	(revision 39864a3af725b9bb35bf4aa3e1774fb1c47a9270)
+++ Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.IO.Test/Configurations/Helpers/ConfigurationClosingStructureInflowModelTypeConverterTest.cs	(.../ConfigurationClosingStructureInflowModelTypeConverterTest.cs)	(revision e772d0383cfbaf86b76034071d206af304a0de4d)
@@ -117,6 +117,20 @@
         }
 
         [Test]
+        public void ConvertTo_InvalidDestinationType_ThrowsNotSupportedException()
+        {
+            // Setup
+            var random = new Random(21);
+            var converter = new ConfigurationClosingStructureInflowModelTypeConverter();
+
+            // Call
+            TestDelegate call = () => converter.ConvertTo(random.NextEnumValue<ConfigurationClosingStructureInflowModelType>(), typeof(object));
+
+            // Assert
+            Assert.Throws<NotSupportedException>(call);
+        }
+
+        [Test]
         [TestCase(ConfigurationClosingStructureInflowModelType.FloodedCulvert, ClosingStructureInflowModelType.FloodedCulvert)]
         [TestCase(ConfigurationClosingStructureInflowModelType.LowSill, ClosingStructureInflowModelType.LowSill)]
         [TestCase(ConfigurationClosingStructureInflowModelType.VerticalWall, ClosingStructureInflowModelType.VerticalWall)]
Index: Ringtoets/Common/test/Ringtoets.Common.IO.Test/Configurations/Helpers/ConfigurationBreakWaterTypeConverterTest.cs
===================================================================
diff -u -r39864a3af725b9bb35bf4aa3e1774fb1c47a9270 -re772d0383cfbaf86b76034071d206af304a0de4d
--- Ringtoets/Common/test/Ringtoets.Common.IO.Test/Configurations/Helpers/ConfigurationBreakWaterTypeConverterTest.cs	(.../ConfigurationBreakWaterTypeConverterTest.cs)	(revision 39864a3af725b9bb35bf4aa3e1774fb1c47a9270)
+++ Ringtoets/Common/test/Ringtoets.Common.IO.Test/Configurations/Helpers/ConfigurationBreakWaterTypeConverterTest.cs	(.../ConfigurationBreakWaterTypeConverterTest.cs)	(revision e772d0383cfbaf86b76034071d206af304a0de4d)
@@ -117,6 +117,20 @@
         }
 
         [Test]
+        public void ConvertTo_InvalidDestinationType_ThrowsNotSupportedException()
+        {
+            // Setup
+            var random = new Random(21);
+            var converter = new ConfigurationBreakWaterTypeConverter();
+
+            // Call
+            TestDelegate call = () => converter.ConvertTo(random.NextEnumValue<ConfigurationBreakWaterType>(), typeof(object));
+
+            // Assert
+            Assert.Throws<NotSupportedException>(call);
+        }
+
+        [Test]
         [TestCase(ConfigurationBreakWaterType.Caisson, BreakWaterType.Caisson)]
         [TestCase(ConfigurationBreakWaterType.Dam, BreakWaterType.Dam)]
         [TestCase(ConfigurationBreakWaterType.Wall, BreakWaterType.Wall)]