Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingSoilLayerTest.cs
===================================================================
diff -u -r49f905d3363336d44ef828259692644dcf5f9edc -r8ed108b83f575f6cb7dc1b89224606894a4bcb7a
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingSoilLayerTest.cs	(.../PipingSoilLayerTest.cs)	(revision 49f905d3363336d44ef828259692644dcf5f9edc)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingSoilLayerTest.cs	(.../PipingSoilLayerTest.cs)	(revision 8ed108b83f575f6cb7dc1b89224606894a4bcb7a)
@@ -44,8 +44,39 @@
             Assert.IsNull(layer.BelowPhreaticLevel);
             Assert.IsNull(layer.DryUnitWeight);
             Assert.IsFalse(layer.IsAquifer);
-            Assert.IsNull(layer.MaterialName);
+            Assert.IsEmpty(layer.MaterialName);
             Assert.AreEqual(Color.Empty, layer.Color);
         }
+
+        [Test]
+        public void MaterialName_Null_ThrowsArgumentNullException()
+        {
+            // Setup
+            var top = new Random(22).NextDouble();
+            var layer = new PipingSoilLayer(top);
+
+            // Call
+            TestDelegate test = () => layer.MaterialName = null;
+
+            // Assert
+            var paramName = Assert.Throws<ArgumentNullException>(test).ParamName;
+            Assert.AreEqual("value", paramName);
+        }
+
+        [Test]
+        [TestCase("")]
+        [TestCase("A name")]
+        public void MaterialName_NotNullValue_ValueSet(string materialName)
+        {
+            // Setup
+            var top = new Random(22).NextDouble();
+            var layer = new PipingSoilLayer(top);
+
+            // Call
+            layer.MaterialName = materialName;
+
+            // Assert
+            Assert.AreEqual(materialName, layer.MaterialName);
+        }
     }
 }
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