public void TestUnsetGetTopBit()
{
ulong max = 0x8000000000000000;
var bit = Bitboard.Get(max, 63);
var bitref = Bitboard.GetRef(ref max, 63);
Assert.IsTrue(bit);
Assert.IsTrue(bitref);
var unset = Bitboard.Unset(max, 63);
Assert.AreEqual((ulong)0, unset);
Assert.AreEqual(0x8000000000000000, max);
Bitboard.UnsetRef(ref max, 63);
Assert.AreEqual((ulong)0, max);
var set = Bitboard.Set(max, 55);
Assert.AreEqual((ulong)0x80000000000000, set);
Assert.AreEqual((ulong)0, max);
set = Bitboard.Set(max, 63);
Assert.AreEqual((ulong)0x8000000000000000, set);
Assert.AreEqual((ulong)0, max);
Bitboard.SetRef(ref max, 63);
Assert.AreEqual((ulong)0x8000000000000000, max);
}
