Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Service.Test/Converters/UpliftVanSlipPlaneConverterTest.cs
===================================================================
diff -u -r566943640717a91ff377a58a341bbbe1bcd2e516 -rdf525a103468d73d229ee5301e20483f1e334b24
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Service.Test/Converters/UpliftVanSlipPlaneConverterTest.cs	(.../UpliftVanSlipPlaneConverterTest.cs)	(revision 566943640717a91ff377a58a341bbbe1bcd2e516)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Service.Test/Converters/UpliftVanSlipPlaneConverterTest.cs	(.../UpliftVanSlipPlaneConverterTest.cs)	(revision df525a103468d73d229ee5301e20483f1e334b24)
@@ -53,7 +53,8 @@
                 GridDeterminationType = MacroStabilityInwardsGridDeterminationType.Automatic,
                 TangentLineDeterminationType = MacroStabilityInwardsTangentLineDeterminationType.Specified,
                 TangentLineZTop = (RoundedDouble) 1,
-                TangentLineZBottom = (RoundedDouble) 0
+                TangentLineZBottom = (RoundedDouble) 0,
+                TangentLineNumber = 10
             };
 
             // Precondition
@@ -101,7 +102,8 @@
                 },
                 TangentLineDeterminationType = MacroStabilityInwardsTangentLineDeterminationType.LayerSeparated,
                 TangentLineZTop = (RoundedDouble) 1,
-                TangentLineZBottom = (RoundedDouble) 0
+                TangentLineZBottom = (RoundedDouble) 0,
+                TangentLineNumber = 10
             };
 
             // Call
@@ -145,7 +147,8 @@
                 },
                 TangentLineDeterminationType = MacroStabilityInwardsTangentLineDeterminationType.Specified,
                 TangentLineZTop = random.NextRoundedDouble(),
-                TangentLineZBottom = random.NextRoundedDouble()
+                TangentLineZBottom = random.NextRoundedDouble(),
+                TangentLineNumber = random.Next()
             };
 
             // Call
@@ -158,7 +161,7 @@
             Assert.IsFalse(slipPlane.TangentLinesAutomaticAtBoundaries);
             Assert.AreEqual(input.TangentLineZTop, slipPlane.TangentZTop);
             Assert.AreEqual(input.TangentLineZBottom, slipPlane.TangentZBottom);
-            Assert.AreEqual(1, slipPlane.TangentLineNumber);
+            Assert.AreEqual(input.TangentLineNumber, slipPlane.TangentLineNumber);
         }
 
         private static void AssertGrid(MacroStabilityInwardsGrid expectedGrid, UpliftVanGrid actualGrid)