Index: Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/TreeNodeInfos/PipingCalculationGroupContextTreeNodeInfoTest.cs
===================================================================
diff -u -rb7c9234daf5a52422362a7cb3fa1f46a86df63bb -r5c9edcbdc21892c4c4bfbff38b07e0873a216826
--- Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/TreeNodeInfos/PipingCalculationGroupContextTreeNodeInfoTest.cs	(.../PipingCalculationGroupContextTreeNodeInfoTest.cs)	(revision b7c9234daf5a52422362a7cb3fa1f46a86df63bb)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/TreeNodeInfos/PipingCalculationGroupContextTreeNodeInfoTest.cs	(.../PipingCalculationGroupContextTreeNodeInfoTest.cs)	(revision 5c9edcbdc21892c4c4bfbff38b07e0873a216826)
@@ -1276,18 +1276,20 @@
                     surfaceLine1,
                     surfaceLine2
                 };
-                pipingFailureMechanism.AddSectionResult(new FailureMechanismSection("Section 1", new List<Point2D>
+                pipingFailureMechanism.AddSections(new[]
                 {
-                    new Point2D(0.0, 0.0),
-                    new Point2D(5.0, 0.0)
-                }));
+                    new FailureMechanismSection("Section 1", new List<Point2D>
+                    {
+                        new Point2D(0.0, 0.0),
+                        new Point2D(5.0, 0.0)
+                    }),
+                    new FailureMechanismSection("Section 2", new List<Point2D>
+                    {
+                        new Point2D(5.0, 0.0),
+                        new Point2D(10.0, 0.0)
+                    })
+                });
 
-                pipingFailureMechanism.AddSectionResult(new FailureMechanismSection("Section 2", new List<Point2D>
-                {
-                    new Point2D(5.0, 0.0),
-                    new Point2D(10.0, 0.0)
-                }));
-
                 var nodeData = new PipingCalculationGroupContext(
                     pipingFailureMechanism.CalculationsGroup,
                     null,
@@ -1390,18 +1392,20 @@
                     surfaceLine1,
                     surfaceLine2
                 };
-                pipingFailureMechanism.AddSectionResult(new FailureMechanismSection("Section 1", new List<Point2D>
+                pipingFailureMechanism.AddSections(new[]
                 {
-                    new Point2D(0.0, 0.0),
-                    new Point2D(5.0, 0.0)
-                }));
+                    new FailureMechanismSection("Section 1", new List<Point2D>
+                    {
+                        new Point2D(0.0, 0.0),
+                        new Point2D(5.0, 0.0)
+                    }),
+                    new FailureMechanismSection("Section 2", new List<Point2D>
+                    {
+                        new Point2D(5.0, 0.0),
+                        new Point2D(10.0, 0.0)
+                    })
+                });
 
-                pipingFailureMechanism.AddSectionResult(new FailureMechanismSection("Section 2", new List<Point2D>
-                {
-                    new Point2D(5.0, 0.0),
-                    new Point2D(10.0, 0.0)
-                }));
-
                 var nodeData = new PipingCalculationGroupContext(group,
                                                                  null,
                                                                  surfaceLines,