public void NextByte_MaxVal()
        {
            var  rng = new ConstantRandomSource(0xFFUL << 56);
            byte x   = rng.NextByte();

            Assert.Equal(255, x);
        }
        public void NextByte_MinVal()
        {
            var  rng = new ConstantRandomSource(0UL);
            byte x   = rng.NextByte();

            Assert.Equal(0, x);
        }