Index: Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Read/SurfaceLineEntityReadExtensionsTest.cs
===================================================================
diff -u -r8ff26e0d7885f432a6e470e8d68ce325bdc6a9bc -r1ba21a629ef9ee35b003e5f5e66f26f5b8bc7766
--- Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Read/SurfaceLineEntityReadExtensionsTest.cs	(.../SurfaceLineEntityReadExtensionsTest.cs)	(revision 8ff26e0d7885f432a6e470e8d68ce325bdc6a9bc)
+++ Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Read/SurfaceLineEntityReadExtensionsTest.cs	(.../SurfaceLineEntityReadExtensionsTest.cs)	(revision 1ba21a629ef9ee35b003e5f5e66f26f5b8bc7766)
@@ -63,14 +63,12 @@
         }
 
         [Test]
-        [TestCase("")]
-        [TestCase(null)]
-        public void ReadAsPipingSurfaceLine_PointsXmlNullOrEmpty_ThrowsArgumentException(string xml)
+        public void ReadAsPipingSurfaceLine_PointsXmlEmpty_ThrowsArgumentException()
         {
             var entity = new SurfaceLineEntity
             {
                 Name = "surface line",
-                PointsXml = xml
+                PointsXml = string.Empty
             };
 
             // Call
@@ -355,14 +353,12 @@
         }
 
         [Test]
-        [TestCase("")]
-        [TestCase(null)]
-        public void ReadAsMacroStabilityInwardsSurfaceLine_PointsXmlNullOrEmpty_ThrowsArgumentException(string xml)
+        public void ReadAsMacroStabilityInwardsSurfaceLine_PointsXmlEmpty_ThrowsArgumentException()
         {
             var entity = new SurfaceLineEntity
             {
                 Name = "surface line",
-                PointsXml = xml
+                PointsXml = string.Empty
             };
 
             // Call