테스트

@RunWith(AndroidJUnit4::class)
@OptIn(UnstableApi::class)
class PlaybackRobolectricTest {

  private lateinit var player: ExoPlayer

  @After
  fun tearDown() {
    if (::player.isInitialized) {
      player.release()
    }
  }

  @Test
  fun play_sampleMediaItem_reachesEndedState() {
    val context = ApplicationProvider.getApplicationContext<Context>()
    player = TestExoPlayerBuilder(context).build()
    player.setMediaItem(MediaItem.fromUri("asset:///media/mp4/sample.mp4"))
    player.prepare()

    play(player).untilState(Player.STATE_ENDED)

    assertThat(player.playbackState).isEqualTo(Player.STATE_ENDED)
  }
}
Testing.kt

@RunWith(AndroidJUnit4.class)
@OptIn(markerClass = UnstableApi.class)
public static class PlaybackRobolectricTest {

  private @Nullable ExoPlayer player;

  @After
  public void tearDown() {
    if (player != null) {
      player.release();
    }
  }

  @Test
  public void play_sampleMediaItem_reachesEndedState() throws Exception {
    Context context = ApplicationProvider.getApplicationContext();
    player = new TestExoPlayerBuilder(context).build();
    player.setMediaItem(MediaItem.fromUri("asset:///media/mp4/sample.mp4"));
    player.prepare();

    play(player).untilState(Player.STATE_ENDED);

    assertThat(player.getPlaybackState()).isEqualTo(Player.STATE_ENDED);
  }
}
Testing.java

val player = TestExoPlayerBuilder(context).build()
val fakeMediaSource = FakeMediaSource(FakeTimeline(/* windowCount= */ 2))
player.setMediaSource(fakeMediaSource)
player.prepare()

play(player).untilMediaItemIndex(/* mediaItemIndex= */ 1)

assertThat(player.currentMediaItemIndex).isEqualTo(1)
player.release()
Testing.kt

ExoPlayer player = new TestExoPlayerBuilder(context).build();
FakeMediaSource fakeMediaSource = new FakeMediaSource(new FakeTimeline(/* windowCount= */ 2));
player.setMediaSource(fakeMediaSource);
player.prepare();

play(player).untilMediaItemIndex(/* mediaItemIndex= */ 1);

assertThat(player.getCurrentMediaItemIndex()).isEqualTo(1);
player.release();
Testing.java

@RunWith(AndroidJUnit4::class)
@OptIn(UnstableApi::class)
class PlaybackInstrumentationTest {

  private lateinit var player: ExoPlayer

  @After
  fun tearDown() =
    runBlocking(Dispatchers.Main) {
      if (::player.isInitialized) {
        player.release()
      }
    }

  @Test
  fun play_sampleMediaItem_advancesAndEnds() =
    runBlocking(Dispatchers.Main) {
      val context = ApplicationProvider.getApplicationContext<Context>()
      player = ExoPlayer.Builder(context).build()
      player.setMediaItem(MediaItem.fromUri("asset:///media/mp4/sample.mp4"))
      player.prepare()

      player.play()
      player.awaitIsPlaying(true)
      player.awaitContentPositionAtLeast(500)
      player.awaitPlaybackState(Player.STATE_ENDED)

      assertThat(player.playbackState).isEqualTo(Player.STATE_ENDED)
    }
}
Testing.kt

@RunWith(AndroidJUnit4.class)
@OptIn(markerClass = UnstableApi.class)
public static class PlaybackInstrumentationTest {

  private @Nullable ExoPlayer player;

  @After
  public void tearDown() {
    InstrumentationRegistry.getInstrumentation()
        .runOnMainSync(() -> {
          if (player != null) {
            player.release();
          }
        });
  }

  @Test
  public void play_sampleMediaItem_advancesAndEnds() throws Exception {
    SettableFuture<Void> playbackStarted = SettableFuture.create();
    SettableFuture<Void> positionPassed = SettableFuture.create();
    SettableFuture<Void> playbackEnded = SettableFuture.create();
    InstrumentationRegistry.getInstrumentation()
        .runOnMainSync(() -> {
          Context context = ApplicationProvider.getApplicationContext();
          player = new ExoPlayer.Builder(context).build();
          player.setMediaItem(MediaItem.fromUri("asset:///media/mp4/sample.mp4"));
          playbackStarted.setFuture(futureWhen(player).isPlaying(true));
          positionPassed.setFuture(futureWhen(player).passesContentPosition(500));
          playbackEnded.setFuture(futureWhen(player).entersPlaybackState(Player.STATE_ENDED));
          player.prepare();
          player.play();
        });

    playbackStarted.get();
    positionPassed.get();
    playbackEnded.get();

    InstrumentationRegistry.getInstrumentation()
        .runOnMainSync(() -> assertThat(player.getPlaybackState()).isEqualTo(Player.STATE_ENDED));
  }
}
Testing.java

// Start awaiting transient events (with a video surface attached) before prepare().
coroutineScope {
  val firstFrameDeferred =
    async(start = CoroutineStart.UNDISPATCHED) { player.awaitFirstFrameRendered() }
  player.setMediaItem(mediaItem)
  player.prepare()
  player.play()
  firstFrameDeferred.await()
}

// Supervise a custom listener condition while still failing fast on player errors.
val metadataTitle = player.awaitSupervised {
  player.mediaMetadata.title?.let {
    return@awaitSupervised it
  }
  val titleDeferred = CompletableDeferred<CharSequence>()
  val listener =
    object : Player.Listener {
      override fun onMediaMetadataChanged(mediaMetadata: MediaMetadata) {
        mediaMetadata.title?.let { titleDeferred.complete(it) }
      }
    }
  player.addListener(listener)
  try {
    titleDeferred.await()
  } finally {
    player.removeListener(listener)
  }
}
Testing.kt

SettableFuture<Void> firstFrameFuture = SettableFuture.create();
SettableFuture<CharSequence> metadataTitleFuture = SettableFuture.create();
SettableFuture<CharSequence> supervisedTitleFuture = SettableFuture.create();
Player.Listener metadataListener =
    new Player.Listener() {
      @Override
      public void onMediaMetadataChanged(MediaMetadata mediaMetadata) {
        if (mediaMetadata.title != null) {
          metadataTitleFuture.set(mediaMetadata.title);
        }
      }
    };

try {
  InstrumentationRegistry.getInstrumentation()
      .runOnMainSync(() -> {
        // Register transient event fences (with a video surface attached) before prepare().
        firstFrameFuture.setFuture(futureWhen(player).rendersFirstFrame());

        // Supervise a custom ListenableFuture so player errors fail fast.
        player.addListener(metadataListener);
        supervisedTitleFuture.setFuture(
            futureWhen(player).withSupervision(metadataTitleFuture));

        player.setMediaItem(mediaItem);
        if (player.getMediaMetadata().title != null) {
          metadataTitleFuture.set(player.getMediaMetadata().title);
        }
        player.prepare();
        player.play();
      });

  firstFrameFuture.get();
  CharSequence title = supervisedTitleFuture.get();
} finally {
  InstrumentationRegistry.getInstrumentation()
      .runOnMainSync(() -> {
        player.removeListener(metadataListener);
        firstFrameFuture.cancel(/* mayInterruptIfRunning= */ true);
        supervisedTitleFuture.cancel(/* mayInterruptIfRunning= */ true);
      });
}
Testing.java

val fakePlayer = FakePlayer(bufferingDelayMs = 0)
fakePlayer.setMediaItem(MediaItem.fromUri("https://example.com/media.mp4"))
fakePlayer.prepare()
fakePlayer.play()

assertThat(fakePlayer.isPlaying).isTrue()

// Drive state transitions directly to test UI or session listeners.
fakePlayer.setPosition(30_000)
fakePlayer.setPlaybackState(Player.STATE_ENDED)
fakePlayer.release()
Testing.kt

FakePlayer fakePlayer = new FakePlayer();
fakePlayer.setMediaItem(MediaItem.fromUri("https://example.com/media.mp4"));
// Drive state transitions directly (prepare() simulates a 100 ms buffering delay by default).
fakePlayer.setPlaybackState(Player.STATE_READY);
fakePlayer.play();

assertThat(fakePlayer.isPlaying()).isTrue();

fakePlayer.setPosition(30_000);
fakePlayer.setPlaybackState(Player.STATE_ENDED);
fakePlayer.release();
Testing.java