public void BlockMask_Delete()
{
var mask = new BlockMask(".", new Block('0', 1, 2), new Block('0', 1, 2), new Block('0', 2, 4));
mask.ToString().Should().Be("|");
mask.Insert("12.34.5678");
mask.ToString().Should().Be("12.34.5678|");
mask.Delete();
mask.ToString().Should().Be("12.34.5678|");
mask.CaretPos = 0;
mask.Delete();
mask.ToString().Should().Be("|2.34.5678");
mask.Delete();
mask.ToString().Should().Be("|34.56.78");
mask.SetText("12.");
mask.Selection = (0, 2);
mask.Delete();
mask.ToString().Should().Be("|");
mask.Insert("12345");
mask.ToString().Should().Be("12.34.5|");
mask.CaretPos = 5;
mask.Delete();
mask.ToString().Should().Be("12.34|");
}