Index: Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/FileImporter/StochasticSoilModelUpdateDataStrategyTest.cs
===================================================================
diff -u -r16df8541528639fd1e8d9f2584fae28808b63fad -ra940166534b3dd6e778de2e7c8e7e5241f3d3381
--- Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/FileImporter/StochasticSoilModelUpdateDataStrategyTest.cs	(.../StochasticSoilModelUpdateDataStrategyTest.cs)	(revision 16df8541528639fd1e8d9f2584fae28808b63fad)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/FileImporter/StochasticSoilModelUpdateDataStrategyTest.cs	(.../StochasticSoilModelUpdateDataStrategyTest.cs)	(revision a940166534b3dd6e778de2e7c8e7e5241f3d3381)
@@ -69,7 +69,7 @@
             var strategy = new StochasticSoilModelUpdateDataStrategy(new PipingFailureMechanism());
 
             // Call
-            TestDelegate test = () => strategy.UpdateModelWithImportedData(new StochasticSoilModelCollection(), null, string.Empty);
+            TestDelegate test = () => strategy.UpdateModelWithImportedData(null, string.Empty);
 
             // Assert
             string paramName = Assert.Throws<ArgumentNullException>(test).ParamName;
@@ -83,28 +83,14 @@
             var strategy = new StochasticSoilModelUpdateDataStrategy(new PipingFailureMechanism());
 
             // Call
-            TestDelegate test = () => strategy.UpdateModelWithImportedData(new StochasticSoilModelCollection(), new List<StochasticSoilModel>(), null);
+            TestDelegate test = () => strategy.UpdateModelWithImportedData(new List<StochasticSoilModel>(), null);
 
             // Assert
             string paramName = Assert.Throws<ArgumentNullException>(test).ParamName;
             Assert.AreEqual("sourceFilePath", paramName);
         }
 
         [Test]
-        public void UpdateModelWithImportedData_TargetCollectionNull_ThrowsArgumentNullException()
-        {
-            // Setup
-            var strategy = new StochasticSoilModelUpdateDataStrategy(new PipingFailureMechanism());
-
-            // Call
-            TestDelegate test = () => strategy.UpdateModelWithImportedData(null, new List<StochasticSoilModel>(), string.Empty);
-
-            // Assert
-            string paramName = Assert.Throws<ArgumentNullException>(test).ParamName;
-            Assert.AreEqual("targetDataCollection", paramName);
-        }
-
-        [Test]
         public void UpdateModelWithImportedData_WithCurrentModelsAndImportedMultipleModelsWithSameName_ThrowsUpdateDataException()
         {
             // Setup
@@ -124,7 +110,7 @@
             };
 
             // Call
-            TestDelegate test = () => strategy.UpdateModelWithImportedData(targetCollection, importedStochasticSoilModels, sourceFilePath);
+            TestDelegate test = () => strategy.UpdateModelWithImportedData(importedStochasticSoilModels, sourceFilePath);
 
             // Assert
             var exception = Assert.Throws<UpdateDataException>(test);
@@ -148,7 +134,7 @@
             };
 
             // Call
-            TestDelegate test = () => strategy.UpdateModelWithImportedData(targetCollection, importedStochasticSoilModels, sourceFilePath);
+            TestDelegate test = () => strategy.UpdateModelWithImportedData(importedStochasticSoilModels, sourceFilePath);
 
             // Assert
             var exception = Assert.Throws<UpdateDataException>(test);
@@ -167,7 +153,7 @@
             var targetCollection = new StochasticSoilModelCollection();
 
             // Call
-            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(targetCollection, importedStochasticSoilModels, "path");
+            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(importedStochasticSoilModels, "path");
 
             // Assert
             Assert.IsEmpty(targetCollection);
@@ -189,12 +175,10 @@
             var readModel = new TestStochasticSoilModel("read");
 
             // Call
-            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(
-                pipingFailureMechanism.StochasticSoilModels,
-                new[]
-                {
-                    readModel
-                }, sourceFilePath);
+            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(new[]
+            {
+                readModel
+            }, sourceFilePath);
 
             // Assert
             Assert.AreSame(readModel, pipingFailureMechanism.StochasticSoilModels[0]);
@@ -211,17 +195,18 @@
             const string modelsName = "same model";
             var existingModel = new TestStochasticSoilModel(modelsName);
 
-            var targetCollection = new StochasticSoilModelCollection();
+            var failureMechanism = new PipingFailureMechanism();
+            var targetCollection = failureMechanism.StochasticSoilModels;
             targetCollection.AddRange(new[]
             {
                 existingModel
             }, sourceFilePath);
 
-            var strategy = new StochasticSoilModelUpdateDataStrategy(new PipingFailureMechanism());
+            var strategy = new StochasticSoilModelUpdateDataStrategy(failureMechanism);
             var readModel = new TestStochasticSoilModel(modelsName);
 
             // Call
-            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(targetCollection, new[]
+            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(new[]
             {
                 readModel
             }, sourceFilePath);
@@ -243,17 +228,18 @@
             const string modelsName = "same model";
             var existingModel = new TestStochasticSoilModel(modelsName);
 
-            var targetCollection = new StochasticSoilModelCollection();
+            var failureMechanism = new PipingFailureMechanism();
+            var targetCollection = failureMechanism.StochasticSoilModels;
             targetCollection.AddRange(new[]
             {
                 existingModel
             }, sourceFilePath);
 
-            var strategy = new StochasticSoilModelUpdateDataStrategy(new PipingFailureMechanism());
+            var strategy = new StochasticSoilModelUpdateDataStrategy(failureMechanism);
             StochasticSoilModel readModel = CreateSimpleModel(modelsName, "new profile A", "new profile B");
 
             // Call
-            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(targetCollection, new[]
+            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(new[]
             {
                 readModel
             }, sourceFilePath);
@@ -276,7 +262,8 @@
             const string modelsName = "same model";
             var existingModel = new TestStochasticSoilModel(modelsName);
 
-            var targetCollection = new StochasticSoilModelCollection();
+            var failureMechanism = new PipingFailureMechanism();
+            var targetCollection = failureMechanism.StochasticSoilModels;
             targetCollection.AddRange(new[]
             {
                 existingModel
@@ -295,14 +282,13 @@
             calculationWithDeletedProfile.InputParameters.StochasticSoilProfile = existingModel.StochasticSoilProfiles[1];
             calculationWithDeletedProfile.Output = new PipingOutput(new PipingOutput.ConstructionProperties());
 
-            var failureMechanism = new PipingFailureMechanism();
             failureMechanism.CalculationsGroup.Children.Add(calculationWithDeletedProfile);
             failureMechanism.CalculationsGroup.Children.Add(calculationWithNotUpdatedProfile);
 
             var strategy = new StochasticSoilModelUpdateDataStrategy(failureMechanism);
 
             // Call
-            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(targetCollection, new[]
+            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(new[]
             {
                 readModel
             }, sourceFilePath).ToArray();
@@ -330,7 +316,8 @@
             const string modelsName = "same model";
             var existingModel = new TestStochasticSoilModel(modelsName);
 
-            var targetCollection = new StochasticSoilModelCollection();
+            var failureMechanism = new PipingFailureMechanism();
+            var targetCollection = failureMechanism.StochasticSoilModels;
             targetCollection.AddRange(new[]
             {
                 existingModel
@@ -350,14 +337,13 @@
             calculationWithNotUpdatedProfile.InputParameters.StochasticSoilProfile = existingModel.StochasticSoilProfiles[1];
             calculationWithNotUpdatedProfile.Output = new PipingOutput(new PipingOutput.ConstructionProperties());
 
-            var failureMechanism = new PipingFailureMechanism();
             failureMechanism.CalculationsGroup.Children.Add(calculationWithNotUpdatedProfile);
             failureMechanism.CalculationsGroup.Children.Add(calculationWithUpdatedProfile);
 
             var strategy = new StochasticSoilModelUpdateDataStrategy(failureMechanism);
 
             // Call
-            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(targetCollection, new[]
+            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(new[]
             {
                 readModel
             }, sourceFilePath).ToArray();
@@ -406,7 +392,7 @@
             var strategy = new StochasticSoilModelUpdateDataStrategy(failureMechanism);
 
             // Call
-            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(stochasticSoilModelCollection, new List<StochasticSoilModel>(), sourceFilePath).ToArray();
+            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(new List<StochasticSoilModel>(), sourceFilePath).ToArray();
 
             // Assert
             Assert.IsFalse(calculation.HasOutput);
@@ -427,7 +413,8 @@
             const string modelsName = "same model";
             var existingModel = new TestStochasticSoilModel(modelsName);
 
-            var targetCollection = new StochasticSoilModelCollection();
+            var failureMechanism = new PipingFailureMechanism();
+            var targetCollection = failureMechanism.StochasticSoilModels;
             targetCollection.AddRange(new[]
             {
                 existingModel
@@ -447,15 +434,14 @@
             calculationWithNotUpdatedProfile.InputParameters.StochasticSoilModel = existingModel;
             calculationWithNotUpdatedProfile.InputParameters.StochasticSoilProfile = unaffectedProfile;
             calculationWithNotUpdatedProfile.Output = new PipingOutput(new PipingOutput.ConstructionProperties());
-
-            var failureMechanism = new PipingFailureMechanism();
+            
             failureMechanism.CalculationsGroup.Children.Add(calculationWithNotUpdatedProfile);
             failureMechanism.CalculationsGroup.Children.Add(calculationWithRemovedProfile);
 
             var strategy = new StochasticSoilModelUpdateDataStrategy(failureMechanism);
 
             // Call
-            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(targetCollection, new[]
+            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(new[]
             {
                 readModel
             }, sourceFilePath).ToArray();