public void NoChanges()
{
TextDocument document = new TextDocument("initial text");
ITextSource snapshot1 = document.CreateSnapshot();
ITextSource snapshot2 = document.CreateSnapshot();
Assert.AreEqual(0, snapshot1.Version.CompareAge(snapshot2.Version));
Assert.AreEqual(0, snapshot1.Version.GetChangesTo(snapshot2.Version).Count());
Assert.AreEqual(document.Text, snapshot1.Text);
Assert.AreEqual(document.Text, snapshot2.Text);
}
public void BackwardChanges()
{
TextDocument document = new TextDocument("initial text");
ITextSource snapshot1 = document.CreateSnapshot();
document.Replace(0, 7, "nw");
document.Insert(1, "e");
ITextSource snapshot2 = document.CreateSnapshot();
Assert.AreEqual(1, snapshot2.Version.CompareAge(snapshot1.Version));
TextChangeEventArgs[] arr = snapshot2.Version.GetChangesTo(snapshot1.Version).ToArray();
Assert.AreEqual(2, arr.Length);
Assert.AreEqual("", arr[0].InsertedText.Text);
Assert.AreEqual("initial", arr[1].InsertedText.Text);
Assert.AreEqual("initial text", snapshot1.Text);
Assert.AreEqual("new text", snapshot2.Text);
}
