public void Calculate_index_from_position()
{
/*
* 01234
* 0 ab_cd
* 1 efg
* 2 hijkl
* 3 mn op
* 4 qrst
*/
var sut = new LineEditor("ab cd efg hijklmn op qrst", 5);
var index = sut.GetIndex(0, 0); // before "a"
Assert.AreEqual(0, index);
index = sut.GetIndex(0, 4); // before "d"
Assert.AreEqual(4, index);
index = sut.GetIndex(1, 0); // before "e"
Assert.AreEqual(6, index);
index = sut.GetIndex(3, 3); // before "o"
Assert.AreEqual(18, index);
index = sut.GetIndex(5, 10); // far after "t"
Assert.AreEqual(sut.Line.Length, index);
}
