public void CheckGetLineInEmptyDocument()
{
Assert.AreEqual(1, document.Lines.Count);
List <DocumentLine> lines = new List <DocumentLine>(document.Lines);
Assert.AreEqual(1, lines.Count);
DocumentLine line = document.Lines[0];
Assert.AreSame(line, lines[0]);
Assert.AreSame(line, document.GetLineByNumber(1));
Assert.AreSame(line, document.GetLineByOffset(0));
}