public void Add()
{
const int len = 1024;
Document doc = new Document();
EditHistory history = new EditHistory();
EditAction action;
Assert.AreEqual(null, history.GetUndoAction());
Assert.AreEqual(false, history.CanUndo);
Assert.AreEqual(false, history.CanRedo);
for (int i = 0; i < len; i++)
{
history.Add(
new EditAction(doc, i, i.ToString(), (i + 'a').ToString(), 0, 0, null)
);
}
Assert.AreEqual(true, history.CanUndo);
Assert.AreEqual(false, history.CanRedo);
for (int i = len - 1; 0 <= i; i--)
{
action = history.GetUndoAction();
Assert.AreEqual(i + "-[" + i + "]+[" + (i + 'a') + "]", action.ToString());
}
Assert.AreEqual(null, history.GetUndoAction());
Assert.AreEqual(false, history.CanUndo);
Assert.AreEqual(true, history.CanRedo);
}
public void Case2()
{
const int len1 = 1024;
const int len2 = 512;
const int len3 = 768;
Document doc = new Document();
EditHistory history = new EditHistory();
EditAction action;
Assert.AreEqual(null, history.GetUndoAction());
Assert.AreEqual(false, history.CanUndo);
Assert.AreEqual(false, history.CanRedo);
// add some
for (int i = 0; i < len1; i++)
{
history.Add(
new EditAction(doc, i, i.ToString(), (i + 'a').ToString(), 0, 0, null)
);
}
Assert.AreEqual(true, history.CanUndo);
Assert.AreEqual(false, history.CanRedo);
// pop some
for (int i = len1 - 1; len2 <= i; i--)
{
action = history.GetUndoAction();
Assert.AreEqual(i + "-[" + i + "]+[" + (i + 'a') + "]", action.ToString());
}
Assert.AreEqual(true, history.CanUndo);
Assert.AreEqual(true, history.CanRedo);
// redo some
for (int i = len2; i < len3; i++)
{
action = history.GetRedoAction();
Assert.AreEqual(i + "-[" + i + "]+[" + (i + 'a') + "]", action.ToString());
}
Assert.AreEqual(true, history.CanUndo);
Assert.AreEqual(true, history.CanRedo);
// add one and ensure that it can redo no more
history.Add(
new EditAction(doc, len3, (len3).ToString(), (len3 + 'a').ToString(), 0, 0, null)
);
Assert.AreEqual(true, history.CanUndo);
Assert.AreEqual(false, history.CanRedo);
// pop all
for (int i = len3; 0 <= i; i--)
{
action = history.GetUndoAction();
Assert.AreEqual(i + "-[" + i + "]+[" + (i + 'a') + "]", action.ToString());
}
Assert.AreEqual(false, history.CanUndo);
Assert.AreEqual(true, history.CanRedo);
Assert.AreEqual(null, history.GetUndoAction());
Assert.AreEqual("0-[0]+[97]", history.GetRedoAction().ToString());
}