public void TestTextLineCompare()
{
TextLine line1 = new TextLine("abc");
TextLine line2 = new TextLine("abc");
Assert.AreEqual(line1.CompareTo(line2), 0);
line2 = new TextLine(" abc ");
Assert.AreEqual(line1.CompareTo(line2), 0);
line2 = new TextLine(" \t \t abc \t \t ");
Assert.AreEqual(line1.CompareTo(line2), 0);
}