模擬方法驗證方法內部的調用

Question

對於單元測試，我正在嘗試驗證是否有一種方法可以使用嘲笑驗證來驗證方法內部的方法調用？

一個例子是：

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

我可以檢查是否通過調用了delete：

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

還有一種檢查內部方法的方法，例如：verify（mock，times（1））。delete（param）.VideoService.deleteVideo（param）;

Answer 1

假設您有一堂課

class MyVideoService {

 final VideoService videoService;

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

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

然后，您可以模擬VideoService

VideoService videoService = mock(VideoService.class);

並使用此模擬實例，調用方法創建MyVideoService，驗證：

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

Answer 2

您可以使用間諜。

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) {
  }
}

如果現在要測試使用MyVideoService的對象。 例如

public class ObjectThatUsesMyVideoService {

  private MyVideoService myVideoService;

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

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

你可以這樣寫一個測試

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");
  }
}