content: /*
   * Copyright (C) 2018 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.google.android.exoplayer2.trackselection;
  
  import static com.google.common.truth.Truth.assertThat;
  import static org.junit.Assert.assertThrows;
  
  import androidx.annotation.Nullable;
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import com.google.android.exoplayer2.ExoPlaybackException;
  import com.google.android.exoplayer2.RendererCapabilities;
  import com.google.android.exoplayer2.Timeline;
  import com.google.android.exoplayer2.source.MediaSource.MediaPeriodId;
  import com.google.android.exoplayer2.source.TrackGroupArray;
  import com.google.android.exoplayer2.trackselection.TrackSelector.InvalidationListener;
  import com.google.android.exoplayer2.upstream.BandwidthMeter;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.mockito.Mockito;
  
  /** Unit test for {@link TrackSelector}. */
  @RunWith(AndroidJUnit4.class)
  public class TrackSelectorTest {
  
    private TrackSelector trackSelector;
  
    @Before
    public void setUp() {
      trackSelector =
          new TrackSelector() {
            @Override
            public TrackSelectorResult selectTracks(
                RendererCapabilities[] rendererCapabilities,
                TrackGroupArray trackGroups,
                MediaPeriodId periodId,
                Timeline timeline)
                throws ExoPlaybackException {
              throw new UnsupportedOperationException();
            }
  
            @Override
            public void onSelectionActivated(@Nullable Object info) {}
          };
    }
  
    @Test
    public void getBandwidthMeter_beforeInitialization_throwsException() {
      assertThrows(IllegalStateException.class, () -> trackSelector.getBandwidthMeter());
    }
  
    @Test
    public void getBandwidthMeter_afterInitialization_returnsProvidedBandwidthMeter() {
      InvalidationListener invalidationListener = Mockito.mock(InvalidationListener.class);
      BandwidthMeter bandwidthMeter = Mockito.mock(BandwidthMeter.class);
      trackSelector.init(invalidationListener, bandwidthMeter);
  
      assertThat(trackSelector.getBandwidthMeter()).isSameInstanceAs(bandwidthMeter);
    }
  
    @Test
    public void getBandwidthMeter_afterRelease_throwsException() {
      InvalidationListener invalidationListener = Mockito.mock(InvalidationListener.class);
      BandwidthMeter bandwidthMeter = Mockito.mock(BandwidthMeter.class);
      trackSelector.init(invalidationListener, bandwidthMeter);
  
      trackSelector.release();
  
      assertThrows(IllegalStateException.class, () -> trackSelector.getBandwidthMeter());
    }
  
    @Test
    public void initialize_afterRelease() {
      InvalidationListener invalidationListener = Mockito.mock(InvalidationListener.class);
      BandwidthMeter bandwidthMeter = Mockito.mock(BandwidthMeter.class);
      trackSelector.init(invalidationListener, bandwidthMeter);
  
      trackSelector.release();
      BandwidthMeter anotherBandwidthMeter = Mockito.mock(BandwidthMeter.class);
      trackSelector.init(invalidationListener, anotherBandwidthMeter);
  
      assertThat(trackSelector.getBandwidthMeter()).isSameInstanceAs(anotherBandwidthMeter);
    }
  }
  