Java 电子邮件模仿失败了

我试图模仿发送电子邮件功能，该功能在特定作业/任务完成时发送电子邮件。当我尝试进行单元测试时，会发现错误。这是测试它的正确方法还是有什么错误或遗漏了什么

@Mock
private MailServiceImpl mailService;

@Mock
private JavaMailSenderImpl javaMailSender;


@Before
public  void setUp() {
    MockitoAnnotations.initMocks(this);
    mailService=new MailServiceImpl(javaMailSender);

}


@Test
public void testSendEmail() {

    try {
        doNothing().when(mailService).sendMail(getEmailProperties());
        mailService.sendMail(getEmailProperties()); 
        verify(mailService,times(1)).sendMail(getEmailProperties());
    } catch (Exception e) {
        Assert.fail(e.getMessage());
    }

}

public EmailProperties getEmailProperties() {

    EmailProperties emailProperties = new EmailProperties();

    emailProperties.setFromAddress("from@Test.com");
    emailProperties.setToAddress("To@Test.com");
    emailProperties.setEmailBody("Test");
    emailProperties.setSubject("Test email");
    emailProperties.setAttachment((File) null);
    emailProperties.setMessageType(1);

    return emailProperties;
  }

下面是testSendEmail方法引发的错误消息。任何建议或任何其他方法来测试它。谷歌搜索没有多大帮助

java.lang.AssertionError: 
    Argument passed to when() is not a mock!
    Example of correct stubbing:
    doThrow(new RuntimeException()).when(mock).someMethod();
    at org.junit.Assert.fail(Assert.java:88)
    at com.xx.xx.xx.mail.MailServiceTest.testSendEmail(MailServiceTest.java:52)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

---

错误消息试图说明

Mockito.when（）

方法只接受mock/spied对象

您在

when

中使用

mailService

，这是错误的，因为它既不是模拟对象，也不是间谍对象

mailService=new MailServiceImpl(javaMailSender);

由于未提供测试中的代码，因此我无法深入了解太多细节

但您可以尝试更换

mailService=newmailserviceimpl（javamailssender）
具有
mailService=Mockito.spy（新的MailServiceImpl（javaMailSender））

这将使您的
mailService
成为mockito可以接受的内容。
删除doNothing（）.when（mailService.sendMail（getEmailProperties（））；修正了这个问题。不确定是什么原因导致此问题
删除doNothing（）.when（mailService）.sendMail（getEmailProperties（））；修正了这个问题。不确定是什么导致了这个问题。谢谢你的回复@Shanu