Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Service/Converters/MacroStabilityInwardsSlipPlaneUpliftVanConverter.cs
===================================================================
diff -u -r7b2237f0bdfa03edcf158d24294c4433266ca91f -r53375024cc287410d9c23b78aa2d806a3a381ae0
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Service/Converters/MacroStabilityInwardsSlipPlaneUpliftVanConverter.cs	(.../MacroStabilityInwardsSlipPlaneUpliftVanConverter.cs)	(revision 7b2237f0bdfa03edcf158d24294c4433266ca91f)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Service/Converters/MacroStabilityInwardsSlipPlaneUpliftVanConverter.cs	(.../MacroStabilityInwardsSlipPlaneUpliftVanConverter.cs)	(revision 53375024cc287410d9c23b78aa2d806a3a381ae0)
@@ -52,7 +52,7 @@
             MacroStabilityInwardsGrid leftGrid = ConvertGrid(result.LeftGrid);
             MacroStabilityInwardsGrid rightGrid = ConvertGrid(result.RightGrid);
 
-            return new MacroStabilityInwardsSlipPlaneUpliftVan(leftGrid, rightGrid, result.TangentLines.Select(tangentLine => new RoundedDouble(2, tangentLine)));
+            return new MacroStabilityInwardsSlipPlaneUpliftVan(leftGrid, rightGrid, result.TangentLines.Select(tangentLine => (RoundedDouble) tangentLine));
         }
 
         private static MacroStabilityInwardsGrid ConvertGrid(UpliftVanGrid grid)
Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Data.Test/MacroStabilityInwardsSlipPlaneUpliftVanTest.cs
===================================================================
diff -u -r7b2237f0bdfa03edcf158d24294c4433266ca91f -r53375024cc287410d9c23b78aa2d806a3a381ae0
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Data.Test/MacroStabilityInwardsSlipPlaneUpliftVanTest.cs	(.../MacroStabilityInwardsSlipPlaneUpliftVanTest.cs)	(revision 7b2237f0bdfa03edcf158d24294c4433266ca91f)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Data.Test/MacroStabilityInwardsSlipPlaneUpliftVanTest.cs	(.../MacroStabilityInwardsSlipPlaneUpliftVanTest.cs)	(revision 53375024cc287410d9c23b78aa2d806a3a381ae0)
@@ -85,8 +85,8 @@
             MacroStabilityInwardsGrid rightGrid = MacroStabilityInwardsGridTestFactory.Create();
             IEnumerable<RoundedDouble> tangentLines = new[]
             {
-                (RoundedDouble) 3.4,
-                (RoundedDouble) 0.1
+                (RoundedDouble) 3.4567,
+                (RoundedDouble) 0.1294
             };
 
             // Call
@@ -97,13 +97,11 @@
 
             Assert.AreSame(leftGrid, result.LeftGrid);
             Assert.AreSame(rightGrid, result.RightGrid);
-            Assert.AreEqual(tangentLines.Count(), result.TangentLines.Count());
-            for (var i = 0; i < tangentLines.Count(); i++)
+            CollectionAssert.AreEqual(new[]
             {
-                RoundedDouble tangentLine = result.TangentLines.ElementAt(i);
-                Assert.AreEqual(2, tangentLine.NumberOfDecimalPlaces);
-                Assert.AreEqual(tangentLines.ElementAt(i), tangentLine, tangentLine.GetAccuracy());
-            }
+                2, 2
+            }, result.TangentLines.Select(tl => tl.NumberOfDecimalPlaces));
+            CollectionAssert.AreEqual(tangentLines.Select(tl => tl.Value), result.TangentLines.Select(tl => tl.Value), new DoubleWithToleranceComparer(1e-2));
         }
 
         [Test]
Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Forms.Test/Factories/MacroStabilityInwardsChartDataPointsFactoryTest.cs
===================================================================
diff -u -r7b2237f0bdfa03edcf158d24294c4433266ca91f -r53375024cc287410d9c23b78aa2d806a3a381ae0
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Forms.Test/Factories/MacroStabilityInwardsChartDataPointsFactoryTest.cs	(.../MacroStabilityInwardsChartDataPointsFactoryTest.cs)	(revision 7b2237f0bdfa03edcf158d24294c4433266ca91f)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Forms.Test/Factories/MacroStabilityInwardsChartDataPointsFactoryTest.cs	(.../MacroStabilityInwardsChartDataPointsFactoryTest.cs)	(revision 53375024cc287410d9c23b78aa2d806a3a381ae0)
@@ -1535,8 +1535,8 @@
             IEnumerable<Point2D[]> lines = MacroStabilityInwardsChartDataPointsFactory.CreateTangentLines(
                 MacroStabilityInwardsGridDeterminationType.Manual,
                 MacroStabilityInwardsTangentLineDeterminationType.Specified,
-                new RoundedDouble(2, bottom),
-                new RoundedDouble(2, top),
+                (RoundedDouble) bottom,
+                (RoundedDouble) top,
                 3,
                 GetSurfaceLineWithGeometry());
 
Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Forms.Test/Views/MacroStabilityInwardsInputViewTest.cs
===================================================================
diff -u -r7b2237f0bdfa03edcf158d24294c4433266ca91f -r53375024cc287410d9c23b78aa2d806a3a381ae0
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Forms.Test/Views/MacroStabilityInwardsInputViewTest.cs	(.../MacroStabilityInwardsInputViewTest.cs)	(revision 7b2237f0bdfa03edcf158d24294c4433266ca91f)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Forms.Test/Views/MacroStabilityInwardsInputViewTest.cs	(.../MacroStabilityInwardsInputViewTest.cs)	(revision 53375024cc287410d9c23b78aa2d806a3a381ae0)
@@ -760,15 +760,18 @@
                 SetGridValues(input.LeftGrid);
                 SetGridValues(input.RightGrid);
 
-                // Call
-                calculation.InputParameters.NotifyObservers();
-
-                // Assert
+                // Precondition
                 ChartDataCollection chartData = view.Chart.Data;
                 List<ChartData> chartDataList = chartData.Collection.ToList();
                 var actualLeftGridData = (ChartPointData) chartDataList[leftGridIndex];
                 var actualRightGridData = (ChartPointData) chartDataList[rightGridIndex];
+                CollectionAssert.IsEmpty(actualLeftGridData.Points);
+                CollectionAssert.IsEmpty(actualRightGridData.Points);
 
+                // Call
+                calculation.InputParameters.NotifyObservers();
+
+                // Assert
                 MacroStabilityInwardsViewChartDataAssert.AssertGridChartData(input.LeftGrid, actualLeftGridData);
                 MacroStabilityInwardsViewChartDataAssert.AssertGridChartData(input.RightGrid, actualRightGridData);
             }
@@ -798,13 +801,16 @@
                 input.TangentLineZBottom = (RoundedDouble) 5;
                 input.TangentLineNumber = 2;
 
+                // Precondition
+                ChartDataCollection chartData = view.Chart.Data;
+                List<ChartData> chartDataList = chartData.Collection.ToList();
+                var tangentLinesData = (ChartMultipleLineData) chartDataList[tangentLinesIndex];
+                CollectionAssert.IsEmpty(tangentLinesData.Lines);
+
                 // Call
                 calculation.InputParameters.NotifyObservers();
 
                 // Assert
-                ChartDataCollection chartData = view.Chart.Data;
-                List<ChartData> chartDataList = chartData.Collection.ToList();
-                var tangentLinesData = (ChartMultipleLineData) chartDataList[tangentLinesIndex];
                 CollectionAssert.AreEqual(new[]
                 {
                     new[]
Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Service.Test/Converters/MacroStabilityInwardsSlipPlaneUpliftVanConverterTest.cs
===================================================================
diff -u -r7b2237f0bdfa03edcf158d24294c4433266ca91f -r53375024cc287410d9c23b78aa2d806a3a381ae0
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Service.Test/Converters/MacroStabilityInwardsSlipPlaneUpliftVanConverterTest.cs	(.../MacroStabilityInwardsSlipPlaneUpliftVanConverterTest.cs)	(revision 7b2237f0bdfa03edcf158d24294c4433266ca91f)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Service.Test/Converters/MacroStabilityInwardsSlipPlaneUpliftVanConverterTest.cs	(.../MacroStabilityInwardsSlipPlaneUpliftVanConverterTest.cs)	(revision 53375024cc287410d9c23b78aa2d806a3a381ae0)
@@ -20,11 +20,9 @@
 // All rights reserved.
 
 using System;
-using System.Collections.Generic;
 using System.Linq;
-using Core.Common.Base.Data;
+using Core.Common.TestUtil;
 using NUnit.Framework;
-using Ringtoets.Common.Data.TestUtil;
 using Ringtoets.MacroStabilityInwards.Data;
 using Ringtoets.MacroStabilityInwards.KernelWrapper.Calculators.UpliftVan;
 using Ringtoets.MacroStabilityInwards.KernelWrapper.Calculators.UpliftVan.Output;
@@ -66,22 +64,11 @@
             MacroStabilityInwardsSlipPlaneUpliftVan output = MacroStabilityInwardsSlipPlaneUpliftVanConverter.Convert(result);
 
             // Assert
-            AssertTangentLines(tangentLines, output.TangentLines);
+            CollectionAssert.AreEqual(tangentLines, output.TangentLines.Select(tl => tl.Value), new DoubleWithToleranceComparer(1e-2));
             AssertGrid(leftGrid, output.LeftGrid);
             AssertGrid(rightGrid, output.RightGrid);
         }
 
-        private static void AssertTangentLines(IEnumerable<double> expectedTangentLines, IEnumerable<RoundedDouble> actualTangentLines)
-        {
-            Assert.AreEqual(expectedTangentLines.Count(), actualTangentLines.Count());
-            for (var i = 0; i < expectedTangentLines.Count(); i++)
-            {
-                RoundedDouble tangentLine = actualTangentLines.ElementAt(i);
-                Assert.AreEqual(2, tangentLine.NumberOfDecimalPlaces);
-                Assert.AreEqual(expectedTangentLines.ElementAt(i), tangentLine, tangentLine.GetAccuracy());
-            }
-        }
-
         private static void AssertGrid(UpliftVanGrid expectedGrid, MacroStabilityInwardsGrid actualGrid)
         {
             Assert.AreEqual(expectedGrid.XLeft, actualGrid.XLeft);
Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Service.Test/MacroStabilityInwardsCalculationServiceTest.cs
===================================================================
diff -u -r7b2237f0bdfa03edcf158d24294c4433266ca91f -r53375024cc287410d9c23b78aa2d806a3a381ae0
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Service.Test/MacroStabilityInwardsCalculationServiceTest.cs	(.../MacroStabilityInwardsCalculationServiceTest.cs)	(revision 7b2237f0bdfa03edcf158d24294c4433266ca91f)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Service.Test/MacroStabilityInwardsCalculationServiceTest.cs	(.../MacroStabilityInwardsCalculationServiceTest.cs)	(revision 53375024cc287410d9c23b78aa2d806a3a381ae0)
@@ -22,11 +22,9 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using Core.Common.Base.Data;
 using Core.Common.TestUtil;
 using log4net.Core;
 using NUnit.Framework;
-using Ringtoets.Common.Data.TestUtil;
 using Ringtoets.Common.Service.TestUtil;
 using Ringtoets.MacroStabilityInwards.CalculatedInput.TestUtil;
 using Ringtoets.MacroStabilityInwards.Data;
@@ -699,22 +697,11 @@
 
         private static void AssertSlipPlaneOutput(UpliftVanCalculationGridResult expected, MacroStabilityInwardsSlipPlaneUpliftVan actual)
         {
-            AssertTangentLines(expected.TangentLines, actual.TangentLines);
+            CollectionAssert.AreEqual(expected.TangentLines, actual.TangentLines.Select(tl => tl.Value), new DoubleWithToleranceComparer(1e-2));
             AssertGrid(expected.LeftGrid, actual.LeftGrid);
             AssertGrid(expected.RightGrid, actual.RightGrid);
         }
 
-        private static void AssertTangentLines(IEnumerable<double> expectedTangentLines, IEnumerable<RoundedDouble> actualTangentLines)
-        {
-            Assert.AreEqual(expectedTangentLines.Count(), actualTangentLines.Count());
-            for (var i = 0; i < expectedTangentLines.Count(); i++)
-            {
-                RoundedDouble tangentLine = actualTangentLines.ElementAt(i);
-                Assert.AreEqual(2, tangentLine.NumberOfDecimalPlaces);
-                Assert.AreEqual(expectedTangentLines.ElementAt(i), tangentLine, tangentLine.GetAccuracy());
-            }
-        }
-
         private static void AssertGrid(UpliftVanGrid expectedGrid, MacroStabilityInwardsGrid actualGrid)
         {
             Assert.AreEqual(expectedGrid.XLeft, actualGrid.XLeft);