@Test
public void testRevertUnsignedLong(){

    UnsignedLong unsignedLong = UnsignedLong.valueOf("12179241258665439971");
    byte[] reversed = Util.revertUnsignedLong(unsignedLong);
    Assert.assertEquals("e3f28878655b05a9", Util.bytesToHex(reversed));
}