public void AddRemove()
{
var list = new UndoRedoList<int>();
// Add
UndoRedoManager.Start("");
list.Add(1);
UndoRedoManager.Commit();
Assert.AreEqual(1, list[0]);
Assert.AreEqual(1, list.Count);
// AddRange
UndoRedoManager.Start("");
list.AddRange(new int[] { 2, 3, 4, 5, 6});
UndoRedoManager.Commit();
Assert.AreEqual(6, list.Count);
// RemoveRange
UndoRedoManager.Start("");
list.RemoveRange(4, 2);
UndoRedoManager.Commit();
// RemoveAt
UndoRedoManager.Start("");
list.RemoveAt(0);
UndoRedoManager.Commit();
// Remove
UndoRedoManager.Start("");
list.Remove(2);
UndoRedoManager.Commit();
Assert.AreEqual(3, list[0]);
Assert.AreEqual(4, list[1]);
Assert.AreEqual(2, list.Count);
UndoRedoManager.Undo();
UndoRedoManager.Undo();
UndoRedoManager.Undo();
Assert.AreEqual(6, list.Count);
UndoRedoManager.Undo(); // undo AddRange
Assert.AreEqual(1, list.Count);
UndoRedoManager.Undo(); // undo Add
Assert.AreEqual(0, list.Count);
UndoRedoManager.Redo(); // redo Add
UndoRedoManager.Redo(); // redo AddRange
Assert.AreEqual(6, list.Count);
Assert.IsTrue(list[0] == 1 && list[1] == 2 && list[2] == 3 && list[3] == 4 && list[4] == 5 && list[5] == 6);
UndoRedoManager.Redo(); // redo RemoveRange
UndoRedoManager.Redo(); // redo RemoveAt
UndoRedoManager.Redo(); // redo Remove
Assert.AreEqual(2, list.Count);
}