public void Test_Jump()
{
var reader = new LineReader (600, 480);
reader.LoadFromFile ("HelloMiku.txt");
reader.Jump (5);
Assert.AreEqual (5, reader.CurrentPosition);
reader.Next ();
Assert.AreEqual (6, reader.CurrentPosition);
reader.Prev ();
Assert.AreEqual (5, reader.CurrentPosition);
reader.Rewind ();
Assert.AreEqual (0, reader.CurrentPosition);
}