java - 测试等待 VideoView 完成以开始新 Activity robolectric 3

Question

我必须测试一个有视频的屏幕启动，当视频结束开始另一个 Activity 时，视频持续时间为 11 秒。

我有以下测试类:

public class ScreenSplashTest {

  private ShadowActivity screenSplash;
  private ShadowVideoView videoView;

  @Before
  public void setUp(){
      ScreenSplash screenSplashActivity = Robolectric.buildActivity(ScreenSplash.class).create().get();
      screenSplash = Shadows.shadowOf(screenSplashActivity);
      VideoView videoViewWidget = (VideoView)screenSplash.findViewById(R.id.videoViewSplash);
      videoView = Shadows.shadowOf(videoViewWidget);
  }

  @Test
  public void activityStarts_VideoStartsToPlay() throws Exception{
      assertTrue(videoView.isPlaying());
  }
  @Test
  public void whenVideoFinish_StartsChooseTeamActivity() throws Exception{
      videoView.stopPlayback();
      Intent nextActivity = screenSplash.getNextStartedActivity();
      assertEquals(nextActivity.getComponent().getClassName(), ChooseTeamActivity.class.getName());
  }
}

这是我的 ScreenSplash Activity :

public class ScreenSplash extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_screen_splash);
        getSupportActionBar().hide();
        this.getWindow().getDecorView().setBackgroundColor(0xffffff);

        VideoView videoView = (VideoView) findViewById(R.id.videoViewSplash);

        Uri videoFile = Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.splash);
        videoView.setVideoURI(videoFile);

        videoView.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mediaPlayer) {
                Intent i = new Intent(getApplicationContext(), ChooseTeamActivity.class);
                startActivity(i);
            }
        });

        videoView.start();
    }
  }

问题是如何为这段代码编写测试？

Answer 1

可以从ShadowVideoView的getOnCompletionListener中得到MediaPlayer.OnCompletionListener，然后调用它的onCompletion方法。您可以模拟 MediaPlayer 对象。一个可能的代码 fragment :

     assertTrue(videoView.isPlaying());
     MediaPlayer.OnCompletionListener completionListener = videoView.getOnCompletionListener();
     completionListener.onCompletion(mock(MediaPlayer.class));
     Intent intent = screenSplash.getNextStartedActivity();
     assertNull(intent);
     assertEquals(ChooseTeamActivity.class.getName(), intent.getComponent().getClassName());

这种方法就能测试上面的代码。如果您正在考虑实际完整播放视频然后执行监听器代码，那么这种方法将不符合单元测试方法。我们测试的是书面代码的功能，而不是底层框架。在这种情况下，您的测试代码应该测试有效的 URI，检查它是否正在播放以及监听器是否执行所需的操作。通过 MediaPlayer 对象测试监听器也将是底层 android 代码的测试，而不仅仅是您的代码。