Index: Ringtoets/WaveImpactAsphaltCover/test/Ringtoets.WaveImpactAsphaltCover.Plugin.Test/TreeNodeInfos/WaveImpactAsphaltCoverFailureMechanismContextTreeNodeInfoTest.cs
===================================================================
diff -u -rbda5bee40c8a756d444e5aeba5907e2617e76f00 -r827cf33fbb55722d0888ed3a18cef230699fe803
--- Ringtoets/WaveImpactAsphaltCover/test/Ringtoets.WaveImpactAsphaltCover.Plugin.Test/TreeNodeInfos/WaveImpactAsphaltCoverFailureMechanismContextTreeNodeInfoTest.cs	(.../WaveImpactAsphaltCoverFailureMechanismContextTreeNodeInfoTest.cs)	(revision bda5bee40c8a756d444e5aeba5907e2617e76f00)
+++ Ringtoets/WaveImpactAsphaltCover/test/Ringtoets.WaveImpactAsphaltCover.Plugin.Test/TreeNodeInfos/WaveImpactAsphaltCoverFailureMechanismContextTreeNodeInfoTest.cs	(.../WaveImpactAsphaltCoverFailureMechanismContextTreeNodeInfoTest.cs)	(revision 827cf33fbb55722d0888ed3a18cef230699fe803)
@@ -209,17 +209,17 @@
                 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 foreshoreProfilesContext = (ForeshoreProfilesContext) inputsFolder.Contents[1];
+                var foreshoreProfilesContext = (ForeshoreProfilesContext) inputsFolder.Contents.ElementAt(1);
                 Assert.AreSame(failureMechanism.ForeshoreProfiles, foreshoreProfilesContext.WrappedData);
                 Assert.AreSame(failureMechanism, foreshoreProfilesContext.ParentFailureMechanism);
                 Assert.AreSame(assessmentSection, foreshoreProfilesContext.ParentAssessmentSection);
 
-                var inputComment = (Comment) inputsFolder.Contents[2];
+                var inputComment = (Comment) inputsFolder.Contents.ElementAt(2);
                 Assert.AreSame(failureMechanism.InputComments, inputComment);
 
                 var hydraulicBoundariesCalculationGroup = (WaveImpactAsphaltCoverWaveConditionsCalculationGroupContext) children[1];
@@ -231,14 +231,14 @@
                 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<WaveImpactAsphaltCoverFailureMechanismSectionResult>)
-                    outputsFolder.Contents[0];
+                    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);
             }
         }