首页 > 解决方案 > 模拟间谍可以返回存根值吗?

问题描述

我想测试这个类,所以它会告诉我我用正确的参数调用 ws:

class MyService {
  public static boolean sendEmail(MyWebService ws) {
      if (!ws.sendCustomEmail("me@example.com", "Subject", "Body")) {
          throw new RuntimeException("can't do this");
      }
      // ... some more logic which can return false and should be tested
      return true;
  }
}

有没有办法将 mockitospy和结合起来thenReturn?我喜欢如何spy显示实际的方法调用,而不仅仅是关于 assertionFailed 的简单消息。

@Test
void myTest() {
  MyService spyWs = Mockito.spy(MyWebService.class);

  // code below is not working, but I wonder if there is some library
  verify(spyWs, once())
    .sendCustomEmail(
        eq("me@example.com"), 
        eq("Subject"), 
        eq("here should be another body and test shou")
    )
    .thenReturn(true);

  MyService::sendEmail(spyWs);
}

结果我想要的是错误消息,向我显示预期参数和实际参数之间的差异,就像通常的间谍一样:

Test failed: 
sendCustomEmail(eq("me@example.com"), eq("Subject"), eq("here should be another body and test should show diff")) was never called
sendCustomEmail(eq("me@example.com"), eq("Subject"), eq("Body")) was called, but not expected

预期的:

标签: javaunit-testingtestingmockito

解决方案


使用Spy时,请使用doReturn().when()语法。同样verify在设置之后:

MyService spyWs = Mockito.spy(MyWebService.class);

doReturn(true).when(spyWs).sendCustomEmail(any(), any(), any());

MyService::sendEmail(spyWs);

verify(spyWs, once())
   .sendCustomEmail(
      eq("me@example.com"), 
      eq("Subject"), 
      eq("here should be another body and test shou")
);

// assert that sendMail returned true;

坦率地说,我认为您不需要在这里进行验证,只需一个布尔断言就足够了,但这取决于您。


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