### Question:
EthUtil { public static Long ethToGwei(BigDecimal ether) { return Convert.fromWei(etherToWei(ether).toString(), Convert.Unit.GWEI).longValue(); } private  EthUtil(); static EthWalletKey generateNewAccount(); static BigDecimal weiToEther(BigInteger wei); static Long ethToGwei(BigDecimal ether); static BigInteger etherToWei(BigDecimal ether); static BigInteger gweiToWei(Long gwei); static BigDecimal gweiToEth(Long gwei); static BigDecimal atmToEth(Long apl); static Long atmToGwei(Long apl); static Long gweiToAtm(Long gwei); static BigDecimal fromAtm(BigDecimal ix); static boolean isAddressValid(String address);  }### Answer:
@Test void ethToGwei() { Long gwei = EthUtil.ethToGwei(ETH); assertEquals(GWEI, gwei); }