Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Data.Test/GeneralGrassCoverErosionOutwardsInputTest.cs
===================================================================
diff -u -r15a5390b22bbd15e777f7df088c61e2b05803723 -rc43715cf3e6dce0c427b10c4852d5ae54e6d668d
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Data.Test/GeneralGrassCoverErosionOutwardsInputTest.cs	(.../GeneralGrassCoverErosionOutwardsInputTest.cs)	(revision 15a5390b22bbd15e777f7df088c61e2b05803723)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Data.Test/GeneralGrassCoverErosionOutwardsInputTest.cs	(.../GeneralGrassCoverErosionOutwardsInputTest.cs)	(revision c43715cf3e6dce0c427b10c4852d5ae54e6d668d)
@@ -57,8 +57,10 @@
         }
 
         [Test]
+        [TestCase(-10)]
         [TestCase(0)]
         [TestCase(21)]
+        [TestCase(50)]
         public void N_ValueOutsideValidRegion_ThrowsArgumentOutOfRangeException(int value)
         {
             // Setup
@@ -68,7 +70,7 @@
             TestDelegate test = () => generalGrassCoverErosionInwardsInput.N = value;
 
             // Assert
-            var expectedMessage = string.Format(Resources.N_Value_should_be_in_interval_1_20, value);
+            var expectedMessage = Resources.N_Value_should_be_in_interval_1_20;
             TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentOutOfRangeException>(test, expectedMessage);
         } 
     }