### Question:
EthModule implements EthModuleSolidity, EthModuleWallet { public String call(Web3.CallArguments args, String bnOrId) { String s = null; try { Block executionBlock = executionBlockRetriever.getExecutionBlock(bnOrId); ProgramResult res = callConstant(args, executionBlock); return s = toJsonHex(res.getHReturn()); } finally { LOGGER.debug("eth_call(): {}", s); } } @Autowired  EthModule(
            UscSystemProperties config,
            Blockchain blockchain,
            ReversibleTransactionExecutor reversibleTransactionExecutor,
            ExecutionBlockRetriever executionBlockRetriever,
            EthModuleSolidity ethModuleSolidity,
            EthModuleWallet ethModuleWallet); @Override String[] accounts(); Map<String, Object> bridgeState(); String call(Web3.CallArguments args, String bnOrId); @Override Map<String, CompilationResultDTO> compileSolidity(String contract); String estimateGas(Web3.CallArguments args); @Override String sendTransaction(Web3.CallArguments args); @Override String sign(String addr, String data);  }### Answer:
@Test public void callSmokeTest() { Web3.CallArguments args = new Web3.CallArguments(); Block executionBlock = mock(Block.class); ExecutionBlockRetriever retriever = mock(ExecutionBlockRetriever.class); when(retriever.getExecutionBlock("latest")) .thenReturn(executionBlock); byte[] hreturn = TypeConverter.stringToByteArray("hello"); ProgramResult executorResult = mock(ProgramResult.class); when(executorResult.getHReturn()) .thenReturn(hreturn); ReversibleTransactionExecutor executor = mock(ReversibleTransactionExecutor.class); when(executor.executeTransaction(eq(executionBlock), any(), any(), any(), any(), any(), any(), any())) .thenReturn(executorResult); EthModule eth = new EthModule( null, null, executor, retriever, null, null ); String result = eth.call(args, "latest"); assertThat(result, is(TypeConverter.toJsonHex(hreturn))); }