Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/DerivedPipingInputTest.cs
===================================================================
diff -u -r2198130ee711ffe22a448aff8b77981b37293050 -rc16357dac6ece1209a66f6e9ee2fd3ff0ae234de
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/DerivedPipingInputTest.cs	(.../DerivedPipingInputTest.cs)	(revision 2198130ee711ffe22a448aff8b77981b37293050)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/DerivedPipingInputTest.cs	(.../DerivedPipingInputTest.cs)	(revision c16357dac6ece1209a66f6e9ee2fd3ff0ae234de)
@@ -36,6 +36,17 @@
     public class DerivedPipingInputTest
     {
         [Test]
+        public void GetPiezometricHeadExit_InputNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => DerivedPipingInput.GetPiezometricHeadExit(null, RoundedDouble.NaN);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
+            Assert.AreEqual("input", paramName);
+        }
+
+        [Test]
         public void GetPiezometricHeadExit_ValidInput_SetsParametersForCalculatorAndReturnsNotNaN()
         {
             // Setup
@@ -78,6 +89,17 @@
         }
 
         [Test]
+        public void GetEffectiveThicknessCoverageLayer_InputNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => DerivedPipingInput.GetEffectiveThicknessCoverageLayer(null);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
+            Assert.AreEqual("input", paramName);
+        }
+
+        [Test]
         public void GetEffectiveThicknessCoverageLayer_SoilProfileSingleAquiferAndCoverageUnderSurfaceLine_ReturnsDistributionWithExpectedMean()
         {
             // Setup
@@ -186,6 +208,17 @@
         }
 
         [Test]
+        public void GetThicknessCoverageLayer_InputNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => DerivedPipingInput.GetThicknessCoverageLayer(null);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
+            Assert.AreEqual("input", paramName);
+        }
+
+        [Test]
         public void GetThicknessCoverageLayer_SoilProfileSingleAquiferAndCoverageUnderSurfaceLine_ReturnsDistributionWithExpectedMean()
         {
             // Setup
@@ -294,6 +327,17 @@
         }
 
         [Test]
+        public void GetThicknessAquiferLayer_InputNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => DerivedPipingInput.GetThicknessAquiferLayer(null);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
+            Assert.AreEqual("input", paramName);
+        }
+
+        [Test]
         public void GetThicknessAquiferLayer_SoilProfileSingleAquiferAndCoverageUnderSurfaceLine_ReturnsDistributionWithExpectedMean()
         {
             // Setup
@@ -485,6 +529,17 @@
         }
 
         [Test]
+        public void GetSeepageLength_InputNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => DerivedPipingInput.GetSeepageLength(null);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
+            Assert.AreEqual("input", paramName);
+        }
+
+        [Test]
         public void GetSeepageLength_ValidData_ReturnsDistributionWithExpectedMean()
         {
             // Setup
@@ -528,6 +583,17 @@
         }
 
         [Test]
+        public void GetSaturatedVolumicWeightOfCoverageLayer_InputNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => DerivedPipingInput.GetSaturatedVolumicWeightOfCoverageLayer(null);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
+            Assert.AreEqual("input", paramName);
+        }
+
+        [Test]
         public void GetSaturatedVolumicWeightOfCoverageLayer_SoilProfileNull_ReturnsDistributionWithParametersNaN()
         {
             // Setup
@@ -818,6 +884,17 @@
         }
 
         [Test]
+        public void GetDarcyPermeability_InputNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => DerivedPipingInput.GetDarcyPermeability(null);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
+            Assert.AreEqual("input", paramName);
+        }
+
+        [Test]
         public void GetDarcyPermeability_SoilProfileNull_ReturnsDistributionWithParametersNaN()
         {
             // Setup
@@ -991,6 +1068,17 @@
         }
 
         [Test]
+        public void GetDiameterD70_InputNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => DerivedPipingInput.GetDiameterD70(null);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
+            Assert.AreEqual("input", paramName);
+        }
+
+        [Test]
         public void GetDiameterD70_SoilProfileNull_ReturnsDistributionWithParametersNaN()
         {
             // Setup