Index: Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/FileImporter/StochasticSoilModelReplaceDataStrategyTest.cs
===================================================================
diff -u -r50597fbeb76b752bc250107dfa91b696bb6c4995 -ra940166534b3dd6e778de2e7c8e7e5241f3d3381
--- Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/FileImporter/StochasticSoilModelReplaceDataStrategyTest.cs	(.../StochasticSoilModelReplaceDataStrategyTest.cs)	(revision 50597fbeb76b752bc250107dfa91b696bb6c4995)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/FileImporter/StochasticSoilModelReplaceDataStrategyTest.cs	(.../StochasticSoilModelReplaceDataStrategyTest.cs)	(revision a940166534b3dd6e778de2e7c8e7e5241f3d3381)
@@ -67,7 +67,7 @@
             var strategy = new StochasticSoilModelReplaceDataStrategy(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;
@@ -81,28 +81,14 @@
             var strategy = new StochasticSoilModelReplaceDataStrategy(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 StochasticSoilModelReplaceDataStrategy(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_WithoutCurrentModelAndModelsImported_NewModelsAdded()
         {
             // Setup
@@ -116,8 +102,7 @@
             var strategy = new StochasticSoilModelReplaceDataStrategy(pipingFailureMechanism);
 
             // Call
-            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(pipingFailureMechanism.StochasticSoilModels,
-                                                                                            importedStochasticSoilModels,
+            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(importedStochasticSoilModels,
                                                                                             "path");
 
             // Assert
@@ -142,7 +127,7 @@
             var strategy = new StochasticSoilModelReplaceDataStrategy(failureMechanism);
 
             // Call
-            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(failureMechanism.StochasticSoilModels, new List<StochasticSoilModel>(), sourceFilePath);
+            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(new List<StochasticSoilModel>(), sourceFilePath);
 
             // Assert
             CollectionAssert.IsEmpty(failureMechanism.StochasticSoilModels);
@@ -167,12 +152,10 @@
             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]);
@@ -204,7 +187,7 @@
             }, sourceFilePath);
 
             // Call
-            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(targetCollection, new List<StochasticSoilModel>(), sourceFilePath).ToArray();
+            IEnumerable<IObservable> affectedObjects = strategy.UpdateModelWithImportedData(new List<StochasticSoilModel>(), sourceFilePath).ToArray();
 
             // Assert
             Assert.IsFalse(calculation.HasOutput);
@@ -231,7 +214,7 @@
             var targetCollection = new StochasticSoilModelCollection();
 
             // Call
-            TestDelegate test = () => strategy.UpdateModelWithImportedData(targetCollection, importedStochasticSoilModels, "path");
+            TestDelegate test = () => strategy.UpdateModelWithImportedData(importedStochasticSoilModels, "path");
 
             // Assert
             var exception = Assert.Throws<UpdateDataException>(test);