Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/TreeNodeInfos/GrassCoverErosionInwardsCalculationContextTreeNodeInfoTest.cs
===================================================================
diff -u -r3bd79dc878fa0b81b1ebb5c35dd5612f2bfed356 -r9643d7e5bbb27a7782b5d939b029a70a1c023138
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/TreeNodeInfos/GrassCoverErosionInwardsCalculationContextTreeNodeInfoTest.cs	(.../GrassCoverErosionInwardsCalculationContextTreeNodeInfoTest.cs)	(revision 3bd79dc878fa0b81b1ebb5c35dd5612f2bfed356)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/TreeNodeInfos/GrassCoverErosionInwardsCalculationContextTreeNodeInfoTest.cs	(.../GrassCoverErosionInwardsCalculationContextTreeNodeInfoTest.cs)	(revision 9643d7e5bbb27a7782b5d939b029a70a1c023138)
@@ -23,6 +23,7 @@
 using Core.Common.Controls.TreeView;
 using Core.Common.Gui;
 using Core.Common.Gui.ContextMenu;
+using Core.Common.Gui.TestUtil.ContextMenu;
 using Core.Common.TestUtil;
 using NUnit.Framework;
 using Rhino.Mocks;
@@ -33,6 +34,7 @@
 using Ringtoets.GrassCoverErosionInwards.Forms.PresentationObjects;
 using Ringtoets.GrassCoverErosionInwards.Plugin;
 using GrassCoverErosionInwardsFormsResources = Ringtoets.GrassCoverErosionInwards.Forms.Properties.Resources;
+using RingtoetsCommonFormsResources = Ringtoets.Common.Forms.Properties.Resources;
 
 namespace Ringtoets.GrassCoverErosionInwards.Forms.Test.TreeNodeInfos
 {
@@ -77,11 +79,12 @@
 
         [Test]
         public void ChildNodeObjects_WithOutputData_ReturnOutputChildNode()
-        {
-            var calculation = mocks.StrictMock<GrassCoverErosionInwardsCalculation>(new GeneralGrassCoverErosionInwardsInput());            
+        {           
             var assessmentSectionMock = mocks.StrictMock<IAssessmentSection>();
             mocks.ReplayAll();
 
+            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput());
+
             var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
             var calculationContext = new GrassCoverErosionInwardsCalculationContext(calculation, failureMechanism, assessmentSectionMock);
 
@@ -99,6 +102,7 @@
 
             var emptyOutput = (EmptyGrassCoverErosionInwardsOutput) children[2];
             Assert.IsNotNull(emptyOutput);
+            mocks.VerifyAll();
         }
 
         [Test]
@@ -110,6 +114,7 @@
             
             var menuBuilderMock = mocks.Stub<IContextMenuBuilder>();
             menuBuilderMock.Expect(mb => mb.AddCustomItem(null)).IgnoreArguments().Return(menuBuilderMock);
+            menuBuilderMock.Expect(mb => mb.AddCustomItem(null)).IgnoreArguments().Return(menuBuilderMock);
             menuBuilderMock.Expect(mb => mb.AddSeparator()).Return(menuBuilderMock);
             menuBuilderMock.Expect(mb => mb.AddRenameItem()).Return(menuBuilderMock);
             menuBuilderMock.Expect(mb => mb.AddDeleteItem()).Return(menuBuilderMock);
@@ -125,7 +130,7 @@
 
             var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
             var assessmentSectionMock = mocks.StrictMock<IAssessmentSection>();
-            var calculation = mocks.StrictMock<GrassCoverErosionInwardsCalculation>(new GeneralGrassCoverErosionInwardsInput());            
+            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput());
             
             var nodeData = new GrassCoverErosionInwardsCalculationContext(calculation, failureMechanism, assessmentSectionMock);
 
@@ -141,5 +146,65 @@
             // Assert
             mocks.VerifyAll(); // Expect no calls on arguments
         }
+
+        [Test]
+        public void ContextMenuStrip_PipingCalculationWithoutOutput_ContextMenuItemClearOutputDisabled()
+        {
+            // Setup
+            var gui = mocks.StrictMock<IGui>();
+            var treeViewControlMock = mocks.StrictMock<TreeViewControl>();
+
+            var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
+            var assessmentSectionMock = mocks.StrictMock<IAssessmentSection>();
+            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput());
+
+            var nodeData = new GrassCoverErosionInwardsCalculationContext(calculation, failureMechanism, assessmentSectionMock);
+
+            gui.Expect(cmp => cmp.Get(nodeData, treeViewControlMock)).Return(new CustomItemsOnlyContextMenuBuilder());
+
+            mocks.ReplayAll();
+
+            plugin.Gui = gui;
+
+            // Call
+            var contextMenu = info.ContextMenuStrip(nodeData, null, treeViewControlMock);
+
+            // Assert
+            mocks.VerifyAll(); // Expect no calls on arguments
+
+            TestHelper.AssertContextMenuStripContainsItem(contextMenu, 0, RingtoetsCommonFormsResources.Calculate, RingtoetsCommonFormsResources.Calculate_ToolTip, RingtoetsCommonFormsResources.CalculateIcon);
+            TestHelper.AssertContextMenuStripContainsItem(contextMenu, 1, RingtoetsCommonFormsResources.Clear_output, RingtoetsCommonFormsResources.ClearOutput_No_output_to_clear, RingtoetsCommonFormsResources.ClearIcon, false);
+        }
+
+        [Test]
+        public void ContextMenuStrip_PipingCalculationWithOutput_ContextMenuItemClearOutputEnabled()
+        {
+            var gui = mocks.StrictMock<IGui>();
+            var treeViewControlMock = mocks.StrictMock<TreeViewControl>();
+
+            var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
+            var assessmentSectionMock = mocks.StrictMock<IAssessmentSection>();
+            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput())
+            {
+                Output = new GrassCoverErosionInwardsOutput(0, 0, 0, 0, 0)
+            };
+
+            var nodeData = new GrassCoverErosionInwardsCalculationContext(calculation, failureMechanism, assessmentSectionMock);
+
+            gui.Expect(cmp => cmp.Get(nodeData, treeViewControlMock)).Return(new CustomItemsOnlyContextMenuBuilder());
+
+            mocks.ReplayAll();
+
+            plugin.Gui = gui;
+
+            // Call
+            var contextMenu = info.ContextMenuStrip(nodeData, null, treeViewControlMock);
+
+            // Assert
+            mocks.VerifyAll(); // Expect no calls on arguments
+
+            TestHelper.AssertContextMenuStripContainsItem(contextMenu, 0, RingtoetsCommonFormsResources.Calculate, RingtoetsCommonFormsResources.Calculate_ToolTip, RingtoetsCommonFormsResources.CalculateIcon);
+            TestHelper.AssertContextMenuStripContainsItem(contextMenu, 1, RingtoetsCommonFormsResources.Clear_output, RingtoetsCommonFormsResources.Clear_output_ToolTip, RingtoetsCommonFormsResources.ClearIcon);
+        }
     }
 }
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