private TransferService transferService;
@Before
public void setUp() {
accountRepository = new SimpleAccountRepository();
FeePolicy feePolicy = new ZeroFeePolicy();
transferService = new DefaultTransferService(accountRepository, feePolicy);
assertThat(accountRepository.findById(A123_ID).getBalance(), equalTo(A123_INITIAL_BAL));
assertThat(accountRepository.findById(C456_ID).getBalance(), equalTo(C456_INITIAL_BAL));
}