public void ToString_Case1()
{
// Arrange
// Act
var zeroString = zero.ToString();
var zeroNextColumn = zero.NextColumn.ToString();
var zeroNextLine = zero.NextLine.ToString();
var zeroNextColumnNextLine = zero.NextColumn.NextLine.ToString();
// Assert
Assert.That(zeroString, Is.EqualTo("CharPosition(Line = 1, Column = 1, Index = 0)"));
Assert.That(zeroNextColumn, Is.EqualTo("CharPosition(Line = 1, Column = 2, Index = 1)"));
Assert.That(zeroNextLine, Is.EqualTo("CharPosition(Line = 2, Column = 1, Index = 1)"));
Assert.That(zeroNextColumnNextLine, Is.EqualTo("CharPosition(Line = 2, Column = 1, Index = 2)"));
}