如何使用 mockito 实现假人？答案

【问题标题】：How to use mockito for implement dummy?如何使用 mockito 实现假人？
【发布时间】：2011-08-17 09:01:54
【问题描述】：

我有简单的代码：

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");
        }

    }
}

我如何为 accountService.verifyBalance() 实现虚拟化

我正在尝试这个：

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

但这并没有生效。

【问题讨论】：

标签： junit mockito

【解决方案1】：

一般 doX() 方法用于模拟异常抛出和 void 方法。其他用途由 when([method_call]).thenX(); 首先使用 setter 或 Whitebox 创建 mock 并将您的 mock 放入经过测试的服务中：

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

你应该像这样模拟与模拟的交互：

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。

【讨论】：