public void XDocumentAddNull()
 {
     XElement xElem = new XElement("root", "text");
     EventsHelper elemHelper = new EventsHelper(xElem);
     xElem.FirstNode.AddBeforeSelf(null);
     elemHelper.Verify(0);
 }

 public void XDocumentTypeDocTypeVariation()
 {
     XDocumentType toChange = new XDocumentType("root", "", "", "");
     XDocumentType original = new XDocumentType(toChange);
     using (EventsHelper eHelper = new EventsHelper(toChange))
     {
         toChange.Name = "newName";
         Assert.True(toChange.Name.Equals("newName"), "Name did not change");
         eHelper.Verify(XObjectChange.Name, toChange);
     }
 }

 public void ExecuteXDocumentVariation(XNode toReplace, XNode newValue)
 {
     XDocument xDoc = new XDocument(toReplace);
     XDocument xDocOriginal = new XDocument(xDoc);
     using (UndoManager undo = new UndoManager(xDoc))
     {
         undo.Group();
         using (EventsHelper docHelper = new EventsHelper(xDoc))
         {
             toReplace.ReplaceWith(newValue);
             docHelper.Verify(new XObjectChange[] { XObjectChange.Remove, XObjectChange.Add }, new XObject[] { toReplace, newValue });
         }
         undo.Undo();
         Assert.True(XNode.DeepEquals(xDoc, xDocOriginal), "Undo did not work!");
     }
 }

 public void ExecuteXDocumentVariation(XNode[] content, int index)
 {
     XDocument xDoc = new XDocument(content);
     XDocument xDocOriginal = new XDocument(xDoc);
     XNode toRemove = xDoc.Nodes().ElementAt(index);
     using (UndoManager undo = new UndoManager(xDoc))
     {
         undo.Group();
         using (EventsHelper docHelper = new EventsHelper(xDoc))
         {
             toRemove.Remove();
             docHelper.Verify(XObjectChange.Remove, toRemove);
         }
         undo.Undo();
         Assert.True(XNode.DeepEquals(xDoc, xDocOriginal), "Undo did not work!");
     }
 }

 public void ExecuteXElementVariation(XElement toChange, XName newName)
 {
     XElement original = new XElement(toChange);
     using (UndoManager undo = new UndoManager(toChange))
     {
         undo.Group();
         using (EventsHelper eHelper = new EventsHelper(toChange))
         {
             toChange.Name = newName;
             Assert.True(newName.Namespace == toChange.Name.Namespace, "Namespace did not change");
             Assert.True(newName.LocalName == toChange.Name.LocalName, "LocalName did not change");
             eHelper.Verify(XObjectChange.Name, toChange);
         }
         undo.Undo();
         Assert.True(XNode.DeepEquals(toChange, original), "Undo did not work");
     }
 }

 public void XProcessingInstructionPIVariation()
 {
     XProcessingInstruction toChange = new XProcessingInstruction("target", "data");
     XProcessingInstruction original = new XProcessingInstruction(toChange);
     using (UndoManager undo = new UndoManager(toChange))
     {
         undo.Group();
         using (EventsHelper eHelper = new EventsHelper(toChange))
         {
             toChange.Target = "newTarget";
             Assert.True(toChange.Target.Equals("newTarget"), "Name did not change");
             eHelper.Verify(XObjectChange.Name, toChange);
         }
         undo.Undo();
         Assert.True(XNode.DeepEquals(toChange, original), "Undo did not work");
     }
 }

 public void ExecuteXElementVariation(XNode toReplace, XNode newValue)
 {
     XElement xElem = new XElement("root", toReplace);
     XElement xElemOriginal = new XElement(xElem);
     using (UndoManager undo = new UndoManager(xElem))
     {
         undo.Group();
         using (EventsHelper eHelper = new EventsHelper(xElem))
         {
             toReplace.ReplaceWith(newValue);
             xElem.Verify();
             eHelper.Verify(new XObjectChange[] { XObjectChange.Remove, XObjectChange.Add }, new XObject[] { toReplace, newValue });
         }
         undo.Undo();
         Assert.True(xElem.Nodes().SequenceEqual(xElemOriginal.Nodes(), XNode.EqualityComparer), "Undo did not work!");
         Assert.True(xElem.Attributes().EqualsAllAttributes(xElemOriginal.Attributes(), Helpers.MyAttributeComparer), "Undo did not work!");
     }
 }

 public void ExecuteXElementVariation(XNode[] content, int index)
 {
     XElement xElem = new XElement("root", content);
     XNode toRemove = xElem.Nodes().ElementAt(index);
     XElement xElemOriginal = new XElement(xElem);
     using (UndoManager undo = new UndoManager(xElem))
     {
         undo.Group();
         using (EventsHelper elemHelper = new EventsHelper(xElem))
         {
             toRemove.Remove();
             xElem.Verify();
             elemHelper.Verify(XObjectChange.Remove, toRemove);
         }
         undo.Undo();
         Assert.True(xElem.Nodes().SequenceEqual(xElemOriginal.Nodes(), XNode.EqualityComparer), "Undo did not work!");
         Assert.True(xElem.Attributes().EqualsAllAttributes(xElemOriginal.Attributes(), Helpers.MyAttributeComparer), "Undo did not work!");
     }
 }

 public void ExecuteXDocumentVariation(XNode[] toAdd, XNode contextNode)
 {
     IEnumerable<XNode> toAddList = toAdd.OfType<XNode>();
     XDocument xDoc = new XDocument(contextNode);
     XDocument xDocOriginal = new XDocument(xDoc);
     using (UndoManager undo = new UndoManager(xDoc))
     {
         undo.Group();
         using (EventsHelper docHelper = new EventsHelper(xDoc))
         {
             using (EventsHelper nodeHelper = new EventsHelper(contextNode))
             {
                 contextNode.AddBeforeSelf(toAdd);
                 Assert.True(toAddList.SequenceEqual(contextNode.NodesBeforeSelf(), XNode.EqualityComparer), "Nodes not added correctly!");
                 nodeHelper.Verify(0);
             }
             docHelper.Verify(XObjectChange.Add, toAdd);
         }
         undo.Undo();
         Assert.True(XNode.DeepEquals(xDoc, xDocOriginal), "Undo did not work!");
     }
 }

 public void ExecuteXElementVariation(XNode[] toAdd, XNode contextNode)
 {
     IEnumerable<XNode> toAddList = toAdd.OfType<XNode>();
     XElement xElem = new XElement("root", contextNode);
     XElement xElemOriginal = new XElement(xElem);
     using (UndoManager undo = new UndoManager(xElem))
     {
         undo.Group();
         using (EventsHelper elemHelper = new EventsHelper(xElem))
         {
             using (EventsHelper nodeHelper = new EventsHelper(contextNode))
             {
                 contextNode.AddBeforeSelf(toAdd);
                 Assert.True(toAddList.SequenceEqual(contextNode.NodesBeforeSelf(), XNode.EqualityComparer), "Nodes not added correctly!");
                 nodeHelper.Verify(0);
             }
             elemHelper.Verify(XObjectChange.Add, toAdd);
         }
         undo.Undo();
         Assert.True(xElem.Nodes().SequenceEqual(xElemOriginal.Nodes(), XNode.EqualityComparer), "Undo did not work!");
         Assert.True(xElem.Attributes().EqualsAllAttributes(xElemOriginal.Attributes(), Helpers.MyAttributeComparer), "Undo did not work!");
     }
 }

 public void XCommentChangeValue()
 {
     XComment toChange = new XComment("Original Value");
     String newValue = "New Value";
     XElement xElem = new XElement("root", toChange);
     XElement xElemOriginal = new XElement(xElem);
     using (UndoManager undo = new UndoManager(xElem))
     {
         undo.Group();
         using (EventsHelper eHelper = new EventsHelper(xElem))
         {
             using (EventsHelper comHelper = new EventsHelper(toChange))
             {
                 toChange.Value = newValue;
                 Assert.True(toChange.Value.Equals(newValue), "Value did not change");
                 xElem.Verify();
                 comHelper.Verify(XObjectChange.Value, toChange);
             }
             eHelper.Verify(XObjectChange.Value, toChange);
         }
         undo.Undo();
         Assert.True(XNode.DeepEquals(xElem, xElemOriginal), "Undo did not work!");
     }
 }

 public void ExecuteXAttributeVariation(XAttribute toChange, object newValue)
 {
     XElement xElem = new XElement("root", toChange);
     XElement xElemOriginal = new XElement(xElem);
     using (UndoManager undo = new UndoManager(xElem))
     {
         undo.Group();
         using (EventsHelper eHelper = new EventsHelper(toChange))
         {
             xElem.SetAttributeValue(toChange.Name, newValue);
             Assert.True(newValue.Equals(toChange.Value), "Value did not change");
             xElem.Verify();
             eHelper.Verify(XObjectChange.Value, toChange);
         }
         undo.Undo();
         Assert.True(xElem.Nodes().SequenceEqual(xElemOriginal.Nodes(), XNode.EqualityComparer), "Undo did not work!");
         Assert.True(xElem.Attributes().EqualsAllAttributes(xElemOriginal.Attributes(), Helpers.MyAttributeComparer), "Undo did not work!");
     }
 }

 public void ExecuteXElementVariation(XElement toChange, object newValue)
 {
     int count = toChange.Nodes().Count();
     XElement xElemOriginal = new XElement(toChange);
     using (UndoManager undo = new UndoManager(toChange))
     {
         undo.Group();
         using (EventsHelper eHelper = new EventsHelper(toChange))
         {
             toChange.SetValue(newValue);
             Assert.True(newValue.Equals(toChange.Value), "Value change was not correct");
             toChange.Verify();
             eHelper.Verify(count + 1);
         }
         undo.Undo();
         Assert.True(toChange.Nodes().SequenceEqual(xElemOriginal.Nodes(), XNode.EqualityComparer), "Undo did not work!");
         Assert.True(toChange.Attributes().EqualsAllAttributes(xElemOriginal.Attributes(), Helpers.MyAttributeComparer), "Undo did not work!");
     }
 }

 public void XDocumentTypeChangeInternalSubset()
 {
     XDocumentType toChange = new XDocumentType("root", "", "", "");
     XDocument xDoc = new XDocument(toChange);
     XDocument xDocOriginal = new XDocument(xDoc);
     using (EventsHelper docHelper = new EventsHelper(xDoc))
     {
         using (EventsHelper typeHelper = new EventsHelper(toChange))
         {
             toChange.InternalSubset = "newValue";
             Assert.True(toChange.InternalSubset.Equals("newValue"), "Internal Subset did not change");
             typeHelper.Verify(XObjectChange.Value, toChange);
         }
         docHelper.Verify(XObjectChange.Value, toChange);
     }
 }

 public void XElementWorkOnTextNodes2()
 {
     XElement elem = new XElement("A", "text2");
     XElement xElemOriginal = new XElement(elem);
     using (UndoManager undo = new UndoManager(elem))
     {
         undo.Group();
         using (EventsHelper eHelper = new EventsHelper(elem))
         {
             elem.Add("text0", "text1");
             Assert.Equal("text2text0text1", elem.Value);
             eHelper.Verify(new XObjectChange[] { XObjectChange.Value, XObjectChange.Value });
         }
         undo.Undo();
         Assert.Equal("text2", elem.Value);
     }
 }

 public void XElementXElementAddAtDeepLevel()
 {
     XDocument xDoc = new XDocument(InputSpace.GetElement(100, 10));
     XDocument xDocOriginal = new XDocument(xDoc);
     using (UndoManager undo = new UndoManager(xDoc))
     {
         undo.Group();
         using (EventsHelper docHelper = new EventsHelper(xDoc))
         {
             using (EventsHelper eHelper = new EventsHelper(xDoc.Root))
             {
                 foreach (XElement x in xDoc.Root.Descendants())
                 {
                     x.Add(new XText("Add Me"));
                     eHelper.Verify(XObjectChange.Add);
                 }
                 docHelper.Verify(XObjectChange.Add, xDoc.Root.Descendants().Count());
             }
         }
         undo.Undo();
         Assert.True(XNode.DeepEquals(xDoc, xDocOriginal), "Undo did not work!");
     }
 }

 public void XElementWorkOnTextNodes1()
 {
     XElement elem = new XElement("A", "text2");
     XNode n = elem.FirstNode;
     using (UndoManager undo = new UndoManager(elem))
     {
         undo.Group();
         using (EventsHelper eHelper = new EventsHelper(elem))
         {
             n.AddBeforeSelf("text0");
             Assert.Equal("text0text2", elem.Value);
             n.AddBeforeSelf("text1");
             Assert.Equal("text0text1text2", elem.Value);
             eHelper.Verify(new XObjectChange[] { XObjectChange.Add, XObjectChange.Value });
         }
         undo.Undo();
         Assert.Equal("text2", elem.Value);
     }
 }

 public void XElementReplaceWithIEnumerable()
 {
     XElement xElem = new XElement("root");
     IEnumerable<XNode> newValue = InputSpace.GetElement(1000, 2).DescendantNodes();
     XElement xElemOriginal = new XElement(xElem);
     using (UndoManager undo = new UndoManager(xElem))
     {
         undo.Group();
         using (EventsHelper eHelper = new EventsHelper(xElem))
         {
             xElem.ReplaceNodes(newValue);
             eHelper.Verify(XObjectChange.Add, newValue.ToArray());
         }
         undo.Undo();
         Assert.True(XNode.DeepEquals(xElem, xElemOriginal), "Undo did not work!");
     }
 }

 public void AddAndRemoveEventListnersXElementAddRemoveEventListners()
 {
     XDocument xDoc = new XDocument(InputSpace.GetElement(10, 10));
     EventsHelper docHelper = new EventsHelper(xDoc);
     EventsHelper eHelper = new EventsHelper(xDoc.Root);
     xDoc.Root.Add(new XElement("Add", "Me"));
     docHelper.Verify(XObjectChange.Add);
     eHelper.Verify(XObjectChange.Add);
     eHelper.RemoveListners();
     xDoc.Root.Add(new XComment("Comment"));
     eHelper.Verify(0);
     docHelper.Verify(XObjectChange.Add);
 }

 public void XElementWorkTextNodes()
 {
     XElement elem = new XElement("A", "text2");
     XElement xElemOriginal = new XElement(elem);
     using (UndoManager undo = new UndoManager(elem))
     {
         undo.Group();
         using (EventsHelper eHelper = new EventsHelper(elem))
         {
             XNode x = elem.LastNode;
             eHelper.Verify(0);
         }
         undo.Undo();
         Assert.True(XNode.DeepEquals(elem, xElemOriginal), "Undo did not work!");
     }
 }