public void BlockingAnkan()
{
var parser = new ShorthandParser("12223m11222333z");
var c = new HandCalculator(parser);
var m2 = TileType.FromSuitAndIndex(Suit.Manzu, 1);
c.Draw(m2);
c.Ankan(m2);
var actual = c.Shanten;
Assert.Equal(1, actual);
}