public void BlockMask_UpdateFrom()
{
var mask = new BlockMask(".", new Block('('), new Block('0', 2, 2), new Block(')'));
mask.Blocks.Length.Should().Be(3);
mask.Delimiters.Should().Be(".");
mask.SetText("(1234)");
mask.ToString().Should().Be("(.12.)|");
mask.CaretPos = 1;
mask.UpdateFrom(new BlockMask(":", new Block('0', 1, 1), new Block('0', 1, 1)));
mask.Blocks.Length.Should().Be(2);
mask.Delimiters.Should().Be(":");
// state should be preserved (Text, Caret/Selection)
mask.ToString().Should().Be("1|:2");
mask.UpdateFrom(null);
mask.Blocks.Length.Should().Be(2);
mask.Delimiters.Should().Be(":");
// state should be preserved (Text, Caret/Selection)
mask.ToString().Should().Be("1|:2");
}