模拟方法验证方法内部的调用

Question

对于单元测试，我正在尝试验证是否有一种方法可以使用嘲笑验证来验证方法内部的方法调用？

一个例子是：

public delete(param) {
    VideoService.deleteVideo(param); << i want to verify the call of this method
    return etc.. 
}

我可以检查是否通过调用了delete：

verify(mock,times(1)).delete(param);

还有一种检查内部方法的方法，例如：verify（mock，times（1））。delete（param）.VideoService.deleteVideo（param）;

Answer 1

假设您有一堂课

class MyVideoService {

 final VideoService videoService;

 public MyVideoService(VideoService videoService) {
   this.videoService = videoService;
 }

 public void delete(param) {
     videoService.deleteVideo(param); 
 }
}

然后，您可以模拟VideoService

VideoService videoService = mock(VideoService.class);

并使用此模拟实例，调用方法创建MyVideoService，验证：

MyVideService myVideoService = new MyVideoService(videoService);
myVideoService.delete (param);
verify(videoService, times(1)).deleteVideo(param);

Answer 2

您可以使用间谍。

public class MyVideoService {

  private VideoService videoService;

  public MyVideoService(VideoService videoService) {
    this.videoService = videoService;
  }

  public void delete(String param) {
    videoService.deleteVideo(param);
  }
}

public class VideoService {
  public void deleteVideo(String param) {
  }
}

如果现在要测试使用MyVideoService的对象。 例如

public class ObjectThatUsesMyVideoService {

  private MyVideoService myVideoService;

  ObjectThatUsesMyVideoService(MyVideoService myVideoService) {
    this.myVideoService = myVideoService;
  }

  public void deleteVideo(String param) {
    myVideoService.delete(param);
  }
}

你可以这样写一个测试

public class MyVideoServiceTest {

  @Test
  public void delete(){
    // VideoService is just a mock
    VideoService videoServiceMock = Mockito.mock(VideoService.class); 

    // Creating the real MyVideoService
    MyVideoService myVideoService = new MyVideoService(videoServiceMock);

    // Creating a spy proxy
    MyVideoService myVideoServiceSpy = Mockito.spy(myVideoService);

    ObjectThatUsesMyVideoService underTest = new ObjectThatUsesMyVideoService(myVideoServiceSpy);

    underTest .deleteVideo("SomeValue");

    // Verify that myVideoService was invoked
    Mockito.verify(myVideoServiceSpy, Mockito.times(1)).delete("SomeValue");

    // Verify that myVideoService invoked the VideoService
    Mockito.verify(videoServiceMock, Mockito.times(1)).deleteVideo("SomeValue");
  }
}