Index: Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Calculation/Math2DTest.cs
===================================================================
diff -u -r3dfdbd9071b9b71d541cb5380004d8b43e3e8f25 -rf69d756f50ae1464a1a11f0780b6d6aa646f3114
--- Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Calculation/Math2DTest.cs	(.../Math2DTest.cs)	(revision 3dfdbd9071b9b71d541cb5380004d8b43e3e8f25)
+++ Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Calculation/Math2DTest.cs	(.../Math2DTest.cs)	(revision f69d756f50ae1464a1a11f0780b6d6aa646f3114)
@@ -3,6 +3,7 @@
 using NUnit.Framework;
 using Ringtoets.Piping.Data;
 using Ringtoets.Piping.IO.Calculation;
+using Ringtoets.Piping.IO.Properties;
 
 namespace Ringtoets.Piping.IO.Test.Calculation
 {
@@ -152,6 +153,20 @@
         }
 
         [Test]
+        public void LineIntersectionWithLine_WithEqualPoints_ThrowsArgumentException()
+        {
+            // Call
+            TestDelegate testA = () => Math2D.LineIntersectionWithLine(new Point2D(0,0), new Point2D(0,0), new Point2D(1,0), new Point2D(0,1));
+            TestDelegate testB = () => Math2D.LineIntersectionWithLine(new Point2D(0, 1), new Point2D(0, 0), new Point2D(1, 1), new Point2D(1, 1));
+
+            // Assert
+            var exceptionA = Assert.Throws<ArgumentException>(testA);
+            var exceptionB = Assert.Throws<ArgumentException>(testB);
+            Assert.AreEqual(Resources.Math2D_LineIntersectionWithLine_Line_points_are_equal,exceptionA.Message);
+            Assert.AreEqual(Resources.Math2D_LineIntersectionWithLine_Line_points_are_equal,exceptionB.Message);
+        }
+
+        [Test]
         public void LineIntersectionWithLine_InterSectionsHigherUpX_ReturnsIntersectionWithTolerance()
         {
             // Setup