如何使用模拟实现虚拟

Question

我有一个简单的代码:

public interface AccountService {
    public boolean verifyBalance(AccountInfo account);
}

public class MoneyTransferServiceBean implements MoneyTransferService {
    private AccountService accountService;
    class MoneyTransfer {
        private TransferRequest request;
        public MoneyTransfer(TransferRequest request) {
            this.request = request;
        }
        private void verifySrcBalance() throws TransferException {
            if (!accountService.verifyBalance("request")
                throw new TransferException("LOW_BALANCE_ERROR_MESSAGE");
        }
    }
}

如何为accountService.verifyBalance()实现虚拟

我在试这个:

private MoneyTransferServiceBean moneyTransferService;
AccountService mockedAccountService = mock(AccountService.class);
doReturn(true).when(mockedAccountService).verifyBalance("request");
MoneyTransfer moneyTransfer = moneyTransferService.new MoneyTransfer(transferRequest);
moneyTransfer.verifySrcBalance();

Answer 1

通常doX()方法用于模拟异常抛出和void方法。当([method_call]).thenX();首先创建mock，并使用setter或Whitebox将mock放入已测试的服务中:

MoneyTransferServiceBean moneyTransferService = new MoneyTransferServiceBean();
AccountService mockedAccountService = mock(AccountService.class);
Whitebox.setInternalState(moneyTransferService , "accountService", mockedAccountService);

应该像这样模拟与mock的交互:

when(mockedAccountService.verifyBalance(eq(accInfo)).thenReturn(true);
verify(mockedAccountService).verifyBalance(accInfo);
verifyNoMoreInteractions(mockedAccountService);

Mockito网站上有很好的例子来解释这一切