Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryGenerator.cs
===================================================================
diff -u -r5220 -r5222
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryGenerator.cs	(.../GeometryGenerator.cs)	(revision 5220)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryGenerator.cs	(.../GeometryGenerator.cs)	(revision 5222)
@@ -1051,7 +1051,7 @@
         }
     }
 
-    private static void DeterminePointClosestToLine(Point2D point1, Point2D point2, GeometryCurve line,
+    protected internal static void DeterminePointClosestToLine(Point2D point1, Point2D point2, GeometryCurve line,
                                                               ref bool isPoint1ClosestToLine,  ref bool isPoint2ClosestToLine)
     {
         double distance1 = Routines2D.CalculateDistanceToLine(point1.X, point1.Z, 
@@ -1066,8 +1066,8 @@
             isPoint2ClosestToLine = false;
     }
 
-    private static void DeterminePointClosestToAnotherPoint(Point2D point1, Point2D point2, Point2D point3,
-                                                            ref bool isPoint1ClosestToPoint3, ref bool isPoint2ClosestToPoint3)
+    protected internal static void DeterminePointClosestToAnotherPoint(Point2D point1, Point2D point2, Point2D point3,
+                                                                       ref bool isPoint1ClosestToPoint3, ref bool isPoint2ClosestToPoint3)
     {
         double distance1 = Routines2D.Compute2DDistance(point1.X, point1.Z, point3.X, point3.Z);
         double distance2 = Routines2D.Compute2DDistance(point2.X, point2.Z, point3.X, point3.Z);
Index: DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geometry/GeometryGeneratorTests.cs
===================================================================
diff -u
--- DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geometry/GeometryGeneratorTests.cs	(revision 0)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geometry/GeometryGeneratorTests.cs	(revision 5222)
@@ -0,0 +1,74 @@
+// Copyright (C) Stichting Deltares 2024. All rights reserved.
+// 
+// This file is part of the Dam Engine.
+// 
+// The Dam Engine is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+// 
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+// 
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System.Security.Cryptography.X509Certificates;
+using Deltares.DamEngine.Data.Geometry;
+using NUnit.Framework;
+
+namespace Deltares.DamEngine.Data.Tests.Geometry;
+
+[TestFixture]
+public class GeometryGeneratorTests
+{
+    [TestCase(0.52, 0.51, false, true)]
+    [TestCase(0.51, 0.52, true, false)]
+    [TestCase(0.51, 0.51, true, false)]
+    [Test]
+    public void WhenDeterminePointClosestToLine_ThenResultIsAsExpected(double x1, double x2, bool isPoint1Closest, bool isPoint2Closest)
+    {
+        // Given
+        var line = new GeometryCurve(new Point2D(0.0, 0.0), new Point2D(1.0, 1.0));
+        var point1 = new Point2D(x1, 0.5);
+        var point2 = new Point2D(x2, 0.5);
+        var isPoint1ClosestToLine = true;
+        var isPoint2ClosestToLine = true;
+        // When
+        GeometryGenerator.DeterminePointClosestToLine(point1, point2, line, ref isPoint1ClosestToLine,  ref isPoint2ClosestToLine);
+        Assert.Multiple(() =>
+        {
+            // Then
+            Assert.That(isPoint1ClosestToLine, Is.EqualTo(isPoint1Closest));
+            Assert.That(isPoint2ClosestToLine, Is.EqualTo(isPoint2Closest));
+        });
+    }
+
+    [TestCase(0.52, 0.51, false, true)]
+    [TestCase(0.51, 0.52, true, false)]
+    [TestCase(0.51, 0.51, true, false)]
+    [Test]
+    public void WhenDeterminePointClosestToAnotherPoint_ThenResultIsAsExpected(double x1, double x2, bool isPoint1Closest, bool isPoint2Closest)
+    {
+        // Given
+        var point1 = new Point2D(x1, 0.5);
+        var point2 = new Point2D(x2, 0.5);
+        var point3 = new Point2D(0.5, 0.5);
+        var isPoint1ClosestToPoint3 = true;
+        var isPoint2ClosestToPoint3 = true;
+        // When
+        GeometryGenerator.DeterminePointClosestToAnotherPoint(point1, point2, point3, ref isPoint1ClosestToPoint3,  ref isPoint2ClosestToPoint3);
+        Assert.Multiple(() =>
+        {
+            // Then
+            Assert.That(isPoint1ClosestToPoint3, Is.EqualTo(isPoint1Closest));
+            Assert.That(isPoint2ClosestToPoint3, Is.EqualTo(isPoint2Closest));
+        });
+    }
+}
\ No newline at end of file
Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Deltares.DamEngine.Data.csproj
===================================================================
diff -u -r4898 -r5222
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Deltares.DamEngine.Data.csproj	(.../Deltares.DamEngine.Data.csproj)	(revision 4898)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Deltares.DamEngine.Data.csproj	(.../Deltares.DamEngine.Data.csproj)	(revision 5222)
@@ -10,5 +10,8 @@
         <AssemblyAttribute Include="System.Runtime.CompilerServices.InternalsVisibleTo">
             <_Parameter1>Deltares.DamEngine.Interface.Tests</_Parameter1>
         </AssemblyAttribute>
+        <AssemblyAttribute Include="System.Runtime.CompilerServices.InternalsVisibleTo">
+            <_Parameter1>Deltares.DamEngine.Data.Tests</_Parameter1>
+        </AssemblyAttribute>
     </ItemGroup>
 </Project>