Index: src/Plugins/Wti/Wti.Calculation/Properties/AssemblyInfo.cs
===================================================================
diff -u -r18f9b18cab9da0c768badb3084415e993a5414ee -r1791d59ecae6050732d7878278154dc4f3bc21f2
--- src/Plugins/Wti/Wti.Calculation/Properties/AssemblyInfo.cs	(.../AssemblyInfo.cs)	(revision 18f9b18cab9da0c768badb3084415e993a5414ee)
+++ src/Plugins/Wti/Wti.Calculation/Properties/AssemblyInfo.cs	(.../AssemblyInfo.cs)	(revision 1791d59ecae6050732d7878278154dc4f3bc21f2)
@@ -1,4 +1,5 @@
 using System.Reflection;
+using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
 // General Information about an assembly is controlled through the following 
@@ -33,3 +34,5 @@
 // [assembly: AssemblyVersion("1.0.*")]
 [assembly: AssemblyVersion("1.0.0.0")]
 [assembly: AssemblyFileVersion("1.0.0.0")]
+
+[assembly: InternalsVisibleTo("Wti.Calculation.Test")]
Index: test/Plugins/Wti/Wti.Calculation.Test/Piping/PipingProfileCreatorTest.cs
===================================================================
diff -u
--- test/Plugins/Wti/Wti.Calculation.Test/Piping/PipingProfileCreatorTest.cs	(revision 0)
+++ test/Plugins/Wti/Wti.Calculation.Test/Piping/PipingProfileCreatorTest.cs	(revision 1791d59ecae6050732d7878278154dc4f3bc21f2)
@@ -0,0 +1,17 @@
+using Deltares.WTIPiping;
+using NUnit.Framework;
+using Wti.Calculation.Piping;
+
+namespace Wti.Calculation.Test.Piping
+{
+    public class PipingProfileCreatorTest
+    {
+        [Test]
+        public void GivenAPipingProfileCreator_WhenCreatingPipingProfile_ThenAProfileWithALayerIsReturned()
+        {
+            var pipingProfileCreator = new PipingProfileCreator();
+            PipingProfile actual = pipingProfileCreator.Create();
+            Assert.That(actual.Layers, Is.Not.Empty);
+        }
+    }
+}
\ No newline at end of file
Index: test/Plugins/Wti/Wti.Calculation.Test/Piping/PipingSurfaceLineCreatorTest.cs
===================================================================
diff -u
--- test/Plugins/Wti/Wti.Calculation.Test/Piping/PipingSurfaceLineCreatorTest.cs	(revision 0)
+++ test/Plugins/Wti/Wti.Calculation.Test/Piping/PipingSurfaceLineCreatorTest.cs	(revision 1791d59ecae6050732d7878278154dc4f3bc21f2)
@@ -0,0 +1,21 @@
+using Deltares.WTIPiping;
+using NUnit.Framework;
+using Wti.Calculation.Piping;
+
+namespace Wti.Calculation.Test.Piping
+{
+    public class PipingSurfaceLineCreatorTest
+    {
+        [Test]
+        public void GivenASurfaceLineCreator_WhenCreatingPipingSurfaceLine_ThenASurfaceLineWithASinglePointAtOrigin()
+        {
+            var pipingSurfaceLineCreator = new PipingSurfaceLineCreator();
+            PipingSurfaceLine actual = pipingSurfaceLineCreator.Create();
+            Assert.That(actual.Points, Is.Not.Empty);
+            Assert.That(actual.Points[0].X, Is.EqualTo(0));
+            Assert.That(actual.Points[0].Y, Is.EqualTo(0));
+            Assert.That(actual.Points[0].Z, Is.EqualTo(0));
+        }
+         
+    }
+}
\ No newline at end of file
Index: test/Plugins/Wti/Wti.Calculation.Test/Wti.Calculation.Test.csproj
===================================================================
diff -u -r9f140a1d7ebc5dfaabd213c626b596ad55f66e56 -r1791d59ecae6050732d7878278154dc4f3bc21f2
--- test/Plugins/Wti/Wti.Calculation.Test/Wti.Calculation.Test.csproj	(.../Wti.Calculation.Test.csproj)	(revision 9f140a1d7ebc5dfaabd213c626b596ad55f66e56)
+++ test/Plugins/Wti/Wti.Calculation.Test/Wti.Calculation.Test.csproj	(.../Wti.Calculation.Test.csproj)	(revision 1791d59ecae6050732d7878278154dc4f3bc21f2)
@@ -66,6 +66,10 @@
     <CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
   </PropertyGroup>
   <ItemGroup>
+    <Reference Include="Deltares.WTIPiping, Version=15.1.1.0, Culture=neutral, processorArchitecture=x86">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>..\..\..\..\lib\Plugins\Wti\Deltares.WTIPiping.dll</HintPath>
+    </Reference>
     <Reference Include="nunit.framework">
       <HintPath>..\..\..\..\lib\nunit.framework.dll</HintPath>
     </Reference>
@@ -76,6 +80,8 @@
     <Compile Include="Piping\PipingCalculationInputTest.cs" />
     <Compile Include="Piping\PipingCalculationResultTest.cs" />
     <Compile Include="Piping\PipingCalculationTest.cs" />
+    <Compile Include="Piping\PipingProfileCreatorTest.cs" />
+    <Compile Include="Piping\PipingSurfaceLineCreatorTest.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>