@Test
public void ensureUnsignedInteger_isDecodedWithCorrectSignum() {

    byte[] bigNumberByteArray = { -13, -75, 19, 86, -119, 67, 112, -4, 118, -86, 98, -46, 103, -42, -126, 63, -60, -15, -87, 57, 43, 11, -17, -52,
                                  0, 3, -65, 14, -67, -40, 65, 119 };
    SolidityType testObject = new SolidityType.UnsignedIntType("uint256");
    Object decode = testObject.decode(bigNumberByteArray);
    assertEquals(decode.getClass(), BigInteger.class);
    BigInteger actualBigInteger = (BigInteger) decode;
    BigInteger expectedBigInteger = new BigInteger(Hex.toHexString(bigNumberByteArray), 16);
    assertEquals(expectedBigInteger, actualBigInteger);
}