Index: Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Plugin.Test/TreeNodeInfos/StabilityStoneCoverFailureMechanismContextTreeNodeInfoTest.cs
===================================================================
diff -u -rbda5bee40c8a756d444e5aeba5907e2617e76f00 -r827cf33fbb55722d0888ed3a18cef230699fe803
--- Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Plugin.Test/TreeNodeInfos/StabilityStoneCoverFailureMechanismContextTreeNodeInfoTest.cs	(.../StabilityStoneCoverFailureMechanismContextTreeNodeInfoTest.cs)	(revision bda5bee40c8a756d444e5aeba5907e2617e76f00)
+++ Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Plugin.Test/TreeNodeInfos/StabilityStoneCoverFailureMechanismContextTreeNodeInfoTest.cs	(.../StabilityStoneCoverFailureMechanismContextTreeNodeInfoTest.cs)	(revision 827cf33fbb55722d0888ed3a18cef230699fe803)
@@ -192,17 +192,17 @@
             Assert.AreEqual("Invoer", inputsFolder.Name);
             Assert.AreEqual(TreeFolderCategory.Input, inputsFolder.Category);
 
-            Assert.AreEqual(3, inputsFolder.Contents.Count);
-            var failureMechanismSectionsContext = (FailureMechanismSectionsContext) inputsFolder.Contents[0];
+            Assert.AreEqual(3, inputsFolder.Contents.Count());
+            var failureMechanismSectionsContext = (FailureMechanismSectionsContext) inputsFolder.Contents.ElementAt(0);
             Assert.AreSame(failureMechanism, failureMechanismSectionsContext.WrappedData);
             Assert.AreSame(assessmentSection, failureMechanismSectionsContext.ParentAssessmentSection);
 
-            var profilesContext = (ForeshoreProfilesContext) inputsFolder.Contents[1];
+            var profilesContext = (ForeshoreProfilesContext) inputsFolder.Contents.ElementAt(1);
             Assert.AreSame(failureMechanism.ForeshoreProfiles, profilesContext.WrappedData);
             Assert.AreSame(failureMechanism, profilesContext.ParentFailureMechanism);
             Assert.AreSame(assessmentSection, profilesContext.ParentAssessmentSection);
 
-            var comment = (Comment) inputsFolder.Contents[2];
+            var comment = (Comment) inputsFolder.Contents.ElementAt(2);
             Assert.AreSame(failureMechanism.InputComments, comment);
 
             var hydraulicBoundariesCalculationGroup = (StabilityStoneCoverWaveConditionsCalculationGroupContext) children[1];
@@ -214,13 +214,13 @@
             var outputsFolder = (CategoryTreeFolder) children[2];
             Assert.AreEqual("Oordeel", outputsFolder.Name);
             Assert.AreEqual(TreeFolderCategory.Output, outputsFolder.Category);
-            Assert.AreEqual(2, outputsFolder.Contents.Count);
+            Assert.AreEqual(2, outputsFolder.Contents.Count());
 
-            var failureMechanismResultsContext = (FailureMechanismSectionResultContext<StabilityStoneCoverFailureMechanismSectionResult>) outputsFolder.Contents[0];
+            var failureMechanismResultsContext = (FailureMechanismSectionResultContext<StabilityStoneCoverFailureMechanismSectionResult>) outputsFolder.Contents.ElementAt(0);
             Assert.AreSame(failureMechanism, failureMechanismResultsContext.FailureMechanism);
             Assert.AreSame(failureMechanism.SectionResults, failureMechanismResultsContext.WrappedData);
 
-            var outputComment = (Comment) outputsFolder.Contents[1];
+            var outputComment = (Comment) outputsFolder.Contents.ElementAt(1);
             Assert.AreSame(failureMechanism.OutputComments, outputComment);
         }