@Test
public void testDoubleLongToBytes() {

   long randomLong1 = RandomUtil.randomLong();
   long randomLong2 = RandomUtil.randomLong();
   ByteBuffer buffer = ByteBuffer.allocate(16);
   buffer.putLong(randomLong1);
   buffer.putLong(randomLong2);
   byte[] assertContent = buffer.array();
   byte[] convertedContent = ByteUtil.doubleLongToBytes(randomLong1, randomLong2);
   assertArrayEquals(assertContent, convertedContent);
}