Index: test/Plugins/Wti/Wti.Calculation.Test/Piping/PipingCalculationTest.cs
===================================================================
diff -u -r82e08784e174b6b2799fc19cc04e7d7aeb7b84e9 -ra3b93c36c2051bd6112327bff0d836ae7883737d
--- test/Plugins/Wti/Wti.Calculation.Test/Piping/PipingCalculationTest.cs	(.../PipingCalculationTest.cs)	(revision 82e08784e174b6b2799fc19cc04e7d7aeb7b84e9)
+++ test/Plugins/Wti/Wti.Calculation.Test/Piping/PipingCalculationTest.cs	(.../PipingCalculationTest.cs)	(revision a3b93c36c2051bd6112327bff0d836ae7883737d)
@@ -1,8 +1,8 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 using NUnit.Framework;
 using Wti.Calculation.Piping;
+using Wti.Calculation.Test.Piping.Stub;
 
 namespace Wti.Calculation.Test.Piping
 {
@@ -237,100 +237,5 @@
             Assert.IsTrue(validationMessages.Any(message => message.Contains("Dtotal")));
         }
 
-        class TestPipingInput
-        {
-            public double WaterVolumetricWeight;
-            public double UpliftModelFactor;
-            public double AssessmentLevel;
-            public double PiezometricHeadExit;
-            public double DampingFactorExit;
-            public double PhreaticLevelExit;
-            public double PiezometricHeadPolder;
-            public double CriticalHeaveGradient;
-            public double ThicknessCoverageLayer;
-            public double SellmeijerModelFactor;
-            public double SellmeijerReductionFactor;
-            public double SeepageLength;
-            public double SandParticlesVolumicWeight;
-            public double WhitesDragCoefficient;
-            public double Diameter70;
-            public double DarcyPermeability;
-            public double WaterKinematicViscosity;
-            public double Gravity;
-            public double ExitPointXCoordinate;
-            public double BeddingAngle;
-            public double MeanDiameter70;
-            public double ThicknessAquiferLayer;
-
-            private readonly Random random = new Random(22);
-            private double last;
-
-            public TestPipingInput()
-            {
-                WaterVolumetricWeight = NextIncrementalDouble();
-                UpliftModelFactor = NextIncrementalDouble();
-                AssessmentLevel = NextIncrementalDouble();
-                PiezometricHeadExit = NextIncrementalDouble();
-                PhreaticLevelExit = NextIncrementalDouble();
-                DampingFactorExit = NextIncrementalDouble();
-                PiezometricHeadPolder = NextIncrementalDouble();
-                CriticalHeaveGradient = NextIncrementalDouble();
-                ThicknessCoverageLayer = NextIncrementalDouble();
-                SellmeijerModelFactor = NextIncrementalDouble();
-                SellmeijerReductionFactor = NextIncrementalDouble();
-                SeepageLength = NextIncrementalDouble();
-                SandParticlesVolumicWeight = NextIncrementalDouble();
-                WhitesDragCoefficient = NextIncrementalDouble();
-                Diameter70 = NextIncrementalDouble();
-                DarcyPermeability = NextIncrementalDouble();
-                WaterKinematicViscosity = NextIncrementalDouble();
-                Gravity = NextIncrementalDouble();
-                ExitPointXCoordinate = NextIncrementalDouble();
-                BeddingAngle = NextIncrementalDouble();
-                MeanDiameter70 = NextIncrementalDouble();
-                ThicknessAquiferLayer = NextIncrementalDouble();
-            }
-
-            /// <summary>
-            /// The returned double is sure to be different from the last time it was called.
-            /// </summary>
-            /// <returns></returns>
-            private double NextIncrementalDouble()
-            {
-                return last += random.NextDouble() + 1e-6;
-            }
-
-            /// <summary>
-            /// Returns the current set value as a <see cref="PipingCalculationInput"/>
-            /// </summary>
-            /// <returns></returns>
-            public PipingCalculationInput AsRealInput()
-            {
-                return new PipingCalculationInput(
-                    WaterVolumetricWeight,
-                    UpliftModelFactor,
-                    AssessmentLevel,
-                    PiezometricHeadExit,
-                    DampingFactorExit,
-                    PhreaticLevelExit,
-                    PiezometricHeadPolder,
-                    CriticalHeaveGradient,
-                    ThicknessCoverageLayer,
-                    SellmeijerModelFactor,
-                    SellmeijerReductionFactor,
-                    SeepageLength,
-                    SandParticlesVolumicWeight,
-                    WhitesDragCoefficient,
-                    Diameter70,
-                    DarcyPermeability,
-                    WaterKinematicViscosity,
-                    Gravity,
-                    ThicknessAquiferLayer,
-                    MeanDiameter70,
-                    BeddingAngle,
-                    ExitPointXCoordinate
-                );
-            }
-        }
     }
 }
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