### Question:
TransactionUtils { public static String generateTransactionHashHexEncoded( RawTransaction rawTransaction, Integer chainId, Credentials credentials) throws CipherException { return Numeric.toHexString(generateTransactionHash(rawTransaction, chainId, credentials)); }  static byte[] generateTransactionHash(
            RawTransaction rawTransaction, Integer chainId, Credentials credentials); static byte[] generateRawTransactionEIP155(
            RawTransaction rawTransaction, Integer chainId, Credentials credentials); static String generateTransactionHashHexEncoded(
            RawTransaction rawTransaction, Integer chainId, 
            Credentials credentials);  }### Answer:
@Test public void testGenerateEip155TransactionHash() throws CipherException { assertThat(generateTransactionHashHexEncoded( TransactionEncoderTest.createContractTransaction(), 100, SampleKeys.CREDENTIALS), is("0x1b3b22c4799e82d7d73469ff898191dd9ea6aa135ce54523f4ec23c0ffb6c132")); }