public void WriteUInt64Test(ulong val)
        {
            // Write
            _bwriter.Open(_testStream);
            _bwriter.WriteUInt64(val);

            // Read
            var bytes  = ReadAsBigEndian(0, sizeof(ulong));
            var result = BitConverter.ToUInt64(bytes, 0);

            // Assert
            Assert.Equal(val, result);
        }