外部模拟方法在实际类中返回Null

Question

当我测试模拟外部调用时，我没有看到报告的模拟值，而是为 Null，并且我的测试失败。我可以在测试类中看到模拟值（报告），但在BusinessServiceImpl类中看不到，并且应用程序（方法返回）没有像我预期的那样被修改。

我的期望是：当我在Impl类中模拟外部调用时，模拟值应该在那里可用，其余的一切都会发生，就好像调用了真正的方法来完成单元测试一样。

实现代码：

package com.core.business.service.dp.fulfillment;

import com.core.business.service.dp.payment.PaymentBusinessService;

public class BusinessServiceImpl implements BusinessService { // Actual Impl Class
    private PaymentBusinessService paymentBusinessService = PluginSystem.INSTANCE.getPluginInjector().getInstance(PaymentBusinessService.class);

    @Transactional( rollbackOn = Throwable.class)
    public Application  applicationValidation (final Deal deal) throws BasePersistenceException {
        Application application = (Application) ApplicationDTOFactory.eINSTANCE.createApplication();
        //External Call we want to Mock
        String report = paymentBusinessService.checkForCreditCardReport(deal.getId());
        if (report != null) {
            application.settingSomething(true); //report is Null and hence not reaching here
        }
        return application;
    }
}

测试代码：

@Test(enabled = true)// Test Class
public void testReCalculatePrepaids() throws Exception {
    PaymentBusinessService paymentBusinessService = mock(PaymentBusinessService.class);
    //Mocking External Call
    when(paymentBusinessService.checkForCreditCardReport(this.deal.getId())).thenReturn(new String ("Decline by only Me"));
    String report = paymentBusinessService.checkForCreditCardReport(this.deal.getId());
    // Mocked value of report available here
    //Calling Impl Class whose one external call is mocked
    //Application is not modified as expected since report is Null in Impl class
    Application sc = BusinessService.applicationValidation(this.deal);
}

Answer 1

我完成了它，并且能够成功地获得模拟的值，而根本不用接触BusinessServiceImpl类。我遵循的步骤是:1 .@ Mock PaymentBusinessService PaymentBusinessService = Mock(PaymentBusinessService . class)；2.@ inject mocks private PaymentBusinessService PaymentBusinessService = PluginSystem。INSTANCE.getPluginInjector()。getInstance(paymentbusinessservice . class)；

然后简单地运行上面的测试，我可以在BusinessServiceImpl中看到报告的值为“仅由我拒绝”，我的测试用例通过了

Answer 2

Mockito的主要目的是隔离测试。如在，当您测试BusinessServiceImpl时，您应该模拟其所有依赖项。

这正是你在上面的例子中想要做的。现在，为了使模拟工作，被模拟的对象必须被注入到您试图测试的类中，在本例中是< code>BusinessServiceImpl。

一种方法是由类的构造者传递依赖关系，即依赖注入。或者您可以看看如何使用< code>Spring和< code>ReflectionTestUtils来实现。