Index: Ringtoets/Common/test/Ringtoets.Common.Service.Test/MessageProviders/DesignWaterLevelCalculationMessageProviderTest.cs
===================================================================
diff -u -rb9037bb177bc4f59fe1029d51c7dbc8d8665ed57 -r4100889a7adfd83736d1b63dd19745b9708bc98c
--- Ringtoets/Common/test/Ringtoets.Common.Service.Test/MessageProviders/DesignWaterLevelCalculationMessageProviderTest.cs	(.../DesignWaterLevelCalculationMessageProviderTest.cs)	(revision b9037bb177bc4f59fe1029d51c7dbc8d8665ed57)
+++ Ringtoets/Common/test/Ringtoets.Common.Service.Test/MessageProviders/DesignWaterLevelCalculationMessageProviderTest.cs	(.../DesignWaterLevelCalculationMessageProviderTest.cs)	(revision 4100889a7adfd83736d1b63dd19745b9708bc98c)
@@ -29,28 +29,19 @@
     public class DesignWaterLevelCalculationMessageProviderTest
     {
         [Test]
-        public void Constructor_CategoryBoundaryNameNull_ThrowsArgumentException()
+        [TestCase(null)]
+        [TestCase("")]
+        public void Constructor_CategoryBoundaryNameInvalid_ThrowsArgumentException(string categoryBoundaryName)
         {
             // Call
-            TestDelegate call = () => new DesignWaterLevelCalculationMessageProvider(null);
+            TestDelegate call = () => new DesignWaterLevelCalculationMessageProvider(categoryBoundaryName);
 
             // Assert
             var exception = Assert.Throws<ArgumentException>(call);
             Assert.AreEqual("'categoryBoundaryName' must have a value.", exception.Message);
         }
 
         [Test]
-        public void Constructor_CategoryBoundaryNameEmpty_ThrowsArgumentException()
-        {
-            // Call
-            TestDelegate call = () => new DesignWaterLevelCalculationMessageProvider("");
-
-            // Assert
-            var exception = Assert.Throws<ArgumentException>(call);
-            Assert.AreEqual("'categoryBoundaryName' must have a value.", exception.Message);
-        }
-
-        [Test]
         public void Constructor_ExpectedValues()
         {
             // Call