Index: DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geotechnics/SoilProfile2DSurfaceLineHelperTests.cs
===================================================================
diff -u -r7057 -r7071
--- DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geotechnics/SoilProfile2DSurfaceLineHelperTests.cs	(.../SoilProfile2DSurfaceLineHelperTests.cs)	(revision 7057)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geotechnics/SoilProfile2DSurfaceLineHelperTests.cs	(.../SoilProfile2DSurfaceLineHelperTests.cs)	(revision 7071)
@@ -521,15 +521,15 @@
 
     /// <summary>
     /// This test reflects the problem found in MWDAM-3279 when creating a new soil profile with a surface line very close to the
-    /// original surface line from the soil profile. 
+    /// original surface line from the soil profile. If both surface lines are too close, the original surface line is used.
     /// </summary>
     [Test]
-    [TestCase(1, 2, 2)]
-    [TestCase(0.1, 0.2, 2)]
-    [TestCase(0.01, 0.02, 2)]
-    [TestCase(0.007, 0.008, 1)]
-    [TestCase(0.001, 0.002, 1)]
-    public void GivenSoilProfile2DWithSteepOrShallowSlopeInTwoPartsAndSurfaceLineCrossingTheSlope_WhenCombiningWithSurfaceLine_ThenExpectedNewSoilProfile2DCreated(double widthLowestSlope, double widthHighestSlope,int expectedLayerCount)
+    [TestCase(1, 2, false)]
+    [TestCase(0.1, 0.2, false)]
+    [TestCase(0.01, 0.02, false)]
+    [TestCase(0.007, 0.008, true)]
+    [TestCase(0.001, 0.002, true)]
+    public void GivenSoilProfile2DWithSteepOrShallowSlopeInTwoPartsAndSurfaceLineCrossingTheSlope_WhenCombiningWithSurfaceLine_ThenExpectedNewSoilProfile2DCreated(double widthLowestSlope, double widthHighestSlope, bool isNewSurfaceLineTooCloseToOriginalSurfaceLine)
     {
         // Given
         SoilProfile2D soilProfile2D = FactoryForSoilProfiles.CreateSoilProfile2DWithSteepOrShallowSlopeInTwoParts(widthLowestSlope, widthHighestSlope);
@@ -547,27 +547,26 @@
 
         // Then
         Assert.That(newSoilProfile2D, Is.Not.Null);
-        Assert.That(newSoilProfile2D.Surfaces, Has.Count.EqualTo(expectedLayerCount));
-        var lineNewSurfaceLine = new Line(surfaceLine.Geometry.Points[1], surfaceLine.Geometry.Points[2]);
-        var lineSurfaceSeparation = new Line(new Point2D(widthLowestSlope, -4.15), new Point2D(10, -4.15));
-        var intersectionPoint = new Point2D();
-        Assert.That(LineHelper.DetermineStrictIntersectionPoint(lineNewSurfaceLine, lineSurfaceSeparation, ref intersectionPoint), Is.True);
+        Assert.That(newSoilProfile2D.Surfaces, Has.Count.EqualTo(2));
 
-        if (expectedLayerCount == 2)
+        var intersectionPoint = new Point2D();
+        if (isNewSurfaceLineTooCloseToOriginalSurfaceLine)
         {
-            var soil1 = new Soil("Surface 1");
-            var soil2 = new Soil("Surface 2");
-            SoilLayer2D expectedSurface1 = FactoryForSoilProfiles.CreatePolygonSoilLayer2D([intersectionPoint, new Point2D(widthLowestSlope + widthHighestSlope, -4.05), new Point2D(10, -4.05), new Point2D(10, -4.15)], soil1, null);
-            SoilLayer2D expectedSurface2 = FactoryForSoilProfiles.CreatePolygonSoilLayer2D([new Point2D(-10, -4.25), new Point2D(0, -4.25), intersectionPoint, new Point2D(10, -4.15), new Point2D(10, -5), new Point2D(-10, -5)], soil2, null);
-            CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurface1);
-            CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurface2);
+            intersectionPoint = originalSurfaceLine.Points[2];
         }
-
-        if (expectedLayerCount == 1)
+        else
         {
-            // When the surface line is too close to the original surface line, the top surface is not generated.
-            CheckSoilProfileContainsSoilLayer(newSoilProfile2D, soilProfile2D.Surfaces[1]);
+            var lineNewSurfaceLine = new Line(surfaceLine.Geometry.Points[1], surfaceLine.Geometry.Points[2]);
+            var lineSurfaceSeparation = new Line(new Point2D(widthLowestSlope, -4.15), new Point2D(10, -4.15));
+            Assert.That(LineHelper.DetermineStrictIntersectionPoint(lineNewSurfaceLine, lineSurfaceSeparation, ref intersectionPoint), Is.True);
         }
+
+        var soil1 = new Soil("Surface 1");
+        var soil2 = new Soil("Surface 2");
+        SoilLayer2D expectedSurface1 = FactoryForSoilProfiles.CreatePolygonSoilLayer2D([intersectionPoint, new Point2D(widthLowestSlope + widthHighestSlope, -4.05), new Point2D(10, -4.05), new Point2D(10, -4.15)], soil1, null);
+        SoilLayer2D expectedSurface2 = FactoryForSoilProfiles.CreatePolygonSoilLayer2D([new Point2D(-10, -4.25), new Point2D(0, -4.25), intersectionPoint, new Point2D(10, -4.15), new Point2D(10, -5), new Point2D(-10, -5)], soil2, null);
+        CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurface1);
+        CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurface2);
     }
 
     /// <summary>