public void BishopMoves()
{
for (int i = 0; i < 64; ++i)
{
IEnumerable <ChessMove> bishopMoves = ChessMove.BishopMoves(i);
int distanceFromEdge = DistanceFromEdge(i);
int count = 7 + 2 * distanceFromEdge;
Assert.AreEqual(count, bishopMoves.Count(), $"# bishop moves from {ChessBoard.SquareName(i)}");
Hue hue = ChessBoard.HueOf(i);
Assert.IsTrue(bishopMoves.All(cm => cm.DestinationSquare.Hue == hue), "Bishop stays on same color");
}
}
internal override IEnumerable <ChessMove> GetValidMoves() => ChessMove.BishopMoves((int)CurrentSquare);
