public void Clear()
{
var dict = new UndoRedoDictionary<int, string>();
UndoRedoManager.Start("");
dict.Add(0, "Zero");
dict.Add(1, "One");
UndoRedoManager.Commit();
UndoRedoManager.Start("");
dict.Add(2, "Two");
dict.Clear();
dict.Add(3, "Three");
UndoRedoManager.Commit();
Assert.IsFalse(dict.ContainsKey(0));
Assert.IsFalse(dict.ContainsKey(1));
Assert.IsFalse(dict.ContainsKey(2));
Assert.AreEqual("Three", dict[3]);
UndoRedoManager.Undo();
Assert.AreEqual("Zero", dict[0]);
Assert.AreEqual("One", dict[1]);
Assert.IsFalse(dict.ContainsKey(2));
Assert.IsFalse(dict.ContainsKey(3));
UndoRedoManager.Redo();
Assert.IsFalse(dict.ContainsKey(0));
Assert.IsFalse(dict.ContainsKey(1));
Assert.IsFalse(dict.ContainsKey(2));
Assert.AreEqual("Three", dict[3]);
}
