Index: test/Plugins/Wti/Wti.Data.Test/PipingSoilProfileTest.cs
===================================================================
diff -u
--- test/Plugins/Wti/Wti.Data.Test/PipingSoilProfileTest.cs	(revision 0)
+++ test/Plugins/Wti/Wti.Data.Test/PipingSoilProfileTest.cs	(revision 46c2fd882297a1243b82d8cacfbb4fc1881f2157)
@@ -0,0 +1,34 @@
+using System;
+using System.Collections.ObjectModel;
+using NUnit.Framework;
+
+namespace Wti.Data.Test
+{
+    public class PipingSoilProfileTest
+    {
+        [Test]
+        [TestCase(1)]
+        [TestCase(5)]
+        public void Constructor_WithNameBottomLayers_ReturnsInstanceWithPropsAndEquivalentLayerCollection(int layerCount)
+        {
+            // Setup
+            var name = "Profile";
+            var bottom = new Random(22).NextDouble();
+            var equivalentLayers = new Collection<PipingSoilLayer>();
+            for (var i = 0; i < layerCount; i++)
+            {
+                equivalentLayers.Add(new PipingSoilLayer(0.0));
+            }
+
+            // Call
+            var profile = new PipingSoilProfile(name, bottom, equivalentLayers);
+
+            // Assert
+            Assert.AreNotSame(equivalentLayers, profile.Layers);
+            CollectionAssert.AreEquivalent(equivalentLayers, profile.Layers);
+            Assert.AreEqual(name, profile.Name);
+            Assert.AreEqual(bottom, profile.Bottom);
+        }
+        
+    }
+}
\ No newline at end of file
Index: test/Plugins/Wti/Wti.IO.Test/Builders/SoilLayer2DTest.cs
===================================================================
diff -u
--- test/Plugins/Wti/Wti.IO.Test/Builders/SoilLayer2DTest.cs	(revision 0)
+++ test/Plugins/Wti/Wti.IO.Test/Builders/SoilLayer2DTest.cs	(revision 46c2fd882297a1243b82d8cacfbb4fc1881f2157)
@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using Wti.Data;
+using Wti.IO.Builders;
+
+namespace Wti.IO.Test.Builders
+{
+    public class SoilLayer2DTest
+    {
+        [Test]
+        public void DefaultConstructor_Always_NotInstantiatedOuterAndInnerLoops()
+        {
+            // Call
+            var result = new SoilLayer2D();
+
+            // Assert
+            Assert.IsNull(result.OuterLoop);
+            Assert.IsNull(result.InnerLoop);
+        }
+
+        [Test]
+        public void AsPipingSoilLayers_DefaultConstructed_ReturnsEmptyCollectionWithMaxValueBottom()
+        {
+            // Setup
+            var layer = new SoilLayer2D();
+            double bottom;
+
+            // Call
+            var result = layer.AsPipingSoilLayers(0.0, out bottom);
+
+            // Assert
+            CollectionAssert.IsEmpty(result);
+            Assert.AreEqual(double.MaxValue, bottom);
+        }
+
+        [Test]
+        public void AsPipingSoilLayers_WithOuterLoopNotIntersectingX_ReturnsEmptyCollectionWithMaxValueBottom()
+        {
+            // Setup
+            var layer = new SoilLayer2D
+            {
+                OuterLoop = new HashSet<Point3D>
+                {
+                    new Point3D
+                    {
+                        X = 0.1, Z = new Random(22).NextDouble()
+                    }
+                }
+            };
+            double bottom;
+
+            // Call
+            var result = layer.AsPipingSoilLayers(0.0, out bottom);
+
+            // Assert
+            CollectionAssert.IsEmpty(result);
+            Assert.AreEqual(double.MaxValue, bottom);
+        }
+    }
+}
\ No newline at end of file
Index: test/Plugins/Wti/Wti.IO.Test/Builders/SoilProfileBuilderTest.cs
===================================================================
diff -u
--- test/Plugins/Wti/Wti.IO.Test/Builders/SoilProfileBuilderTest.cs	(revision 0)
+++ test/Plugins/Wti/Wti.IO.Test/Builders/SoilProfileBuilderTest.cs	(revision 46c2fd882297a1243b82d8cacfbb4fc1881f2157)
@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using Wti.Data;
+using Wti.IO.Builders;
+using Wti.IO.Properties;
+
+namespace Wti.IO.Test.Builders
+{
+    public class SoilProfileBuilderTest
+    {
+        [Test]
+        [TestCase(null)]
+        [TestCase("name")]
+        public void Constructor_WithNameInvalidX_ThrowsArgumentExcpetion(string name)
+        {
+            // Call
+            TestDelegate test = () => new SoilProfileBuilder(name, double.NaN);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentException>(test);
+            Assert.AreEqual(Resources.Error_SoilProfileBuilderCantDetermineIntersectAtDoubleNaN, exception.Message);
+        }
+
+        [Test]
+        [TestCase(null)]
+        [TestCase("name")]
+        public void Constructor_WithNameValidX_ReturnsNewInstance(string name)
+        {
+            // Call
+            var builder = new SoilProfileBuilder(name, 0.0);
+
+            // Assert
+            Assert.NotNull(builder);
+        }
+
+        [Test]
+        public void Build_WithOutLayers_ThrowsArgumentException()
+        {
+            // Setup
+            var profileName = "SomeProfile";
+            var builder = new SoilProfileBuilder(profileName, 0.0);
+
+            // Call
+            TestDelegate test = () => builder.Build();
+
+            // Assert
+            Assert.Throws<ArgumentException>(test);
+        }
+    }
+}
\ No newline at end of file